diff --git a/src/bin/harness_subagent_audit.rs b/src/bin/harness_subagent_audit.rs
index 53a6320e2d..1e333a7ecb 100644
--- a/src/bin/harness_subagent_audit.rs
+++ b/src/bin/harness_subagent_audit.rs
@@ -447,6 +447,7 @@ async fn drain_progress(
                 prompt_chars,
                 worker_thread_id,
                 display_name,
+                ..
             } => {
                 eprintln!(
                     "[harness_subagent_audit] progress turn={} subagent_spawned agent_id={} task_id={} mode={} dedicated_thread={} prompt_chars={} worker_thread_id={}",
@@ -586,7 +587,7 @@ async fn drain_progress(
                 output: _,
                 elapsed_ms,
                 iteration,
-                failure: _,
+                ..
             } => {
                 eprintln!(
                     "[harness_subagent_audit] progress turn={} subagent_tool_completed agent_id={} task_id={} tool={} call_id={} success={} output_chars={} elapsed_ms={} iteration={}",
diff --git a/src/openhuman/agent/harness/session/tool_progress.rs b/src/openhuman/agent/harness/session/tool_progress.rs
index 83861fa091..3515be0437 100644
--- a/src/openhuman/agent/harness/session/tool_progress.rs
+++ b/src/openhuman/agent/harness/session/tool_progress.rs
@@ -176,6 +176,10 @@ impl ProgressReporter for TurnProgress {
                     tool_name: tool_name.to_string(),
                     success,
                     output_chars: output.chars().count(),
+                    output: output.to_string(),
+                    // The legacy reporter path has no captured argument
+                    // payload at completion time.
+                    arguments: None,
                     elapsed_ms,
                     iteration,
                     failure: None,
diff --git a/src/openhuman/agent/progress.rs b/src/openhuman/agent/progress.rs
index a45cb9a596..f6f132ff35 100644
--- a/src/openhuman/agent/progress.rs
+++ b/src/openhuman/agent/progress.rs
@@ -54,6 +54,18 @@ pub enum AgentProgress {
         tool_name: String,
         success: bool,
         output_chars: usize,
+        /// Full text the tool returned. Mirrors
+        /// [`Self::SubagentToolCallCompleted::output`] so trace exporters can
+        /// record the parent-scope tool result as the span output (truncated +
+        /// content-gated at the collector). Empty when the harness ran with
+        /// payload capture off.
+        output: String,
+        /// The arguments the tool was invoked with, when the harness captured
+        /// them (`PayloadCapture::tool_io`). The crate emits arguments on the
+        /// *completed* event, so trace exporters use this to backfill the tool
+        /// span's input (the started event's `arguments` is `Null` on the
+        /// tinyagents path).
+        arguments: Option<serde_json::Value>,
         elapsed_ms: u64,
         /// 1-based iteration index.
         iteration: u32,
@@ -89,6 +101,11 @@ pub enum AgentProgress {
         /// "Researcher", "Coding Agent"). Falls back to `agent_id` in
         /// the UI when absent.
         display_name: Option<String>,
+        /// The full delegated prompt text. `prompt_chars` stays as the cheap
+        /// size hint; trace exporters record this (truncated + content-gated)
+        /// as the subagent span's input so a delegation is inspectable
+        /// end-to-end in Langfuse.
+        prompt: String,
     },
 
     /// A sub-agent completed successfully.
@@ -103,6 +120,9 @@ pub enum AgentProgress {
         iterations: u32,
         /// Character length of the sub-agent's final assistant text.
         output_chars: usize,
+        /// The sub-agent's full final assistant text. Trace exporters record
+        /// this (truncated + content-gated) as the subagent span's output.
+        output: String,
         /// Absolute path to the worker's isolated `git worktree` checkout,
         /// when it ran with `isolation = "worktree"` (#3376). `None` for
         /// non-isolated (read-only / shared-workspace) workers.
@@ -187,6 +207,11 @@ pub enum AgentProgress {
         /// actual result/output. `output_chars` is kept as a cheap size hint
         /// for consumers that only want the length.
         output: String,
+        /// The arguments the tool was invoked with, when the harness captured
+        /// them (`PayloadCapture::tool_io`). Backfills the tool span's input in
+        /// trace exports (the started event's `arguments` is `Null` on the
+        /// tinyagents path).
+        arguments: Option<serde_json::Value>,
         elapsed_ms: u64,
         /// 1-based child iteration index.
         iteration: u32,
@@ -292,12 +317,27 @@ pub enum AgentProgress {
     /// [`Self::TurnCostUpdated`] (cumulative rollup), every field here is
     /// **per-call**, so trace exporters can render each model invocation as
     /// its own Langfuse generation with exact model + token + cost figures.
-    /// Emitted once per parent-scope model call, right after the usage block
-    /// is recorded; child (subagent) calls stay inside the cumulative rollup
-    /// because this event carries no task attribution.
+    /// Emitted once per model call — parent-scope calls carry
+    /// `subagent_task_id: None`; child (subagent) calls carry the owning
+    /// task id so exporters can nest the generation under the subagent span.
     ModelCallCompleted {
         /// Model that served this call (tier handle or concrete model id).
         model: String,
+        /// Provider that served this call (`"managed"`, `"openai"`,
+        /// `"ollama"`, …). Trace exporters render the Langfuse model as
+        /// `{provider_id}.{model}` (e.g. `managed.chat-v1`).
+        provider_id: String,
+        /// Owning subagent task id when this call ran inside a child run
+        /// (`spawn_subagent` / Context Scout). `None` for parent-scope calls.
+        subagent_task_id: Option<String>,
+        /// The request messages sent to the model (including the system
+        /// prompt), when the harness captured them
+        /// (`PayloadCapture::model_io`). Trace exporters record this as the
+        /// generation's input, gated on `capture_content`.
+        input: Option<serde_json::Value>,
+        /// The model completion (assistant message), when captured. Recorded
+        /// as the generation's output, gated on `capture_content`.
+        output: Option<serde_json::Value>,
         /// 1-based iteration index (one model call per iteration).
         iteration: u32,
         /// Input/prompt tokens for this call.
diff --git a/src/openhuman/agent/progress_tracing.rs b/src/openhuman/agent/progress_tracing.rs
index 4681418274..9efa86db20 100644
--- a/src/openhuman/agent/progress_tracing.rs
+++ b/src/openhuman/agent/progress_tracing.rs
@@ -24,9 +24,12 @@
 //! ## Privacy
 //!
 //! Spans always carry *metadata* — span names, counts, timings, and
-//! token/cost figures. While `observability.agent_tracing.capture_content` is
-//! on, the turn's prompt/reply and **truncated** tool arguments/results are
-//! additionally recorded as span `input`/`output`; with the flag off (the
+//! token/cost figures (model labels are `{provider_id}.{model}`, e.g.
+//! `managed.chat-v1`). While `observability.agent_tracing.capture_content` is
+//! on, content is additionally recorded as span `input`/`output` — the turn's
+//! prompt/reply, each generation's **truncated** request messages (system
+//! prompt included) + completion, **truncated** tool arguments/results, and
+//! each subagent's delegated prompt + final output. With the flag off (the
 //! default — #4454), none of that content ever reaches the in-memory span, so
 //! no exporter (NDJSON file, app log, or Langfuse) can leak it.
 //! Streamed text/thinking deltas (`TextDelta`, `ThinkingDelta`,
@@ -315,15 +318,6 @@ pub struct SpanCollector {
     /// fresh nonce makes every span id globally unique.
     id_prefix: String,
 
-    /// Storage-level privacy gate (mirrors
-    /// `observability.agent_tracing.capture_content`). When `false` (the
-    /// default), prompt/reply content from [`AgentProgress::TurnContent`] is
-    /// **never attached to a span** — so no exporter (NDJSON file, app log, or
-    /// Langfuse push) can ever serialize it. This is the single choke point
-    /// referenced in the module docs: gating at storage protects every present
-    /// and future exporter, not just the transmission path.
-    capture_content: bool,
-
     turn_span_id: Option<String>,
     turn_span_index: Option<usize>,
     current_iteration_span_id: Option<String>,
@@ -342,8 +336,6 @@ impl SpanCollector {
             spans: Vec::new(),
             next_span_seq: 0,
             id_prefix: uuid::Uuid::new_v4().simple().to_string(),
-            // Metadata-only by default; opt in via `with_content_capture`.
-            capture_content: false,
             turn_span_id: None,
             turn_span_index: None,
             current_iteration_span_id: None,
@@ -353,12 +345,14 @@ impl SpanCollector {
         }
     }
 
-    /// Opt into attaching prompt/reply content to spans (from
-    /// [`AgentProgress::TurnContent`]). Wire this to
-    /// `observability.agent_tracing.capture_content`. Left off, content is
-    /// dropped at storage time so it can never reach any exporter.
+    /// Opt into attaching content to spans (prompt/reply, generation
+    /// request/completion, tool + subagent I/O). Wire this to
+    /// `observability.agent_tracing.capture_content`. Equivalent to setting
+    /// [`TraceContext::with_capture_content`] before construction — there is a
+    /// single storage-level gate (`ctx.capture_content`), so content dropped
+    /// here can never reach any exporter.
     pub fn with_content_capture(mut self, capture_content: bool) -> Self {
-        self.capture_content = capture_content;
+        self.ctx.capture_content = capture_content;
         self
     }
 
@@ -549,11 +543,20 @@ impl SpanCollector {
     /// Fold a per-call `ModelCallCompleted` into the tree:
     ///
     /// 1. emit a closed [`SpanKind::Generation`] span (name `llm.<model>`)
-    ///    parented under the current iteration, carrying exact per-call
-    ///    model/usage/cost plus provenance (`gen_ai.provider`) and the pricing
-    ///    basis the local estimator would use;
-    /// 2. accumulate reasoning / cache-creation tokens onto the root turn
-    ///    span, which `TurnCostUpdated` (cumulative rollup) does not carry.
+    ///    parented under the current iteration — or, for a child call
+    ///    (`subagent_task_id` set), under the owning subagent's current
+    ///    iteration — carrying exact per-call model/usage/cost plus provenance
+    ///    (`gen_ai.provider`) and the pricing basis the local estimator uses;
+    /// 2. record the captured request messages (incl. the system prompt) and
+    ///    completion as the generation's input/output, gated on
+    ///    `capture_content` and truncated to [`MAX_MODEL_CONTENT_CHARS`];
+    /// 3. accumulate reasoning / cache-creation tokens onto the root turn
+    ///    span, which `TurnCostUpdated` (cumulative rollup) does not carry —
+    ///    and, for child calls, roll model + usage onto the subagent span so
+    ///    a delegation (e.g. the Context Scout) surfaces its model natively.
+    ///
+    /// The Langfuse-facing model label is `{provider_id}.{model}` (e.g.
+    /// `managed.chat-v1`, `openai.gpt-4o`).
     ///
     /// Generation start is approximated by the enclosing iteration span's
     /// start (the iteration opens on `ModelStarted`); end is the observation
@@ -562,6 +565,10 @@ impl SpanCollector {
     fn record_model_call(
         &mut self,
         model: &str,
+        provider_id: &str,
+        subagent_task_id: Option<&str>,
+        input: Option<&serde_json::Value>,
+        output: Option<&serde_json::Value>,
         iteration: u32,
         input_tokens: u64,
         output_tokens: u64,
@@ -571,24 +578,37 @@ impl SpanCollector {
         cost_usd: f64,
         now_unix_ms: u64,
     ) {
-        let start_unix_ms = self
-            .current_iteration_index
+        // Resolve the parent + start basis: a child call nests under its
+        // subagent's current iteration (else the subagent span itself); a
+        // parent call nests under the turn's current iteration (else root).
+        let subagent_state = subagent_task_id.and_then(|id| self.subagents.get(id));
+        let (parent, start_basis_index) = match subagent_state {
+            Some(state) => match &state.current_iteration_span_id {
+                Some(id) => {
+                    let idx = self.span_index_by_id(id);
+                    (id.clone(), idx)
+                }
+                None => (
+                    self.spans[state.span_index].span_id.clone(),
+                    Some(state.span_index),
+                ),
+            },
+            None => {
+                let parent = self.active_parent_id(now_unix_ms);
+                (parent, self.current_iteration_index)
+            }
+        };
+        let start_unix_ms = start_basis_index
             .and_then(|idx| self.spans.get(idx))
             .map(|span| span.start_unix_ms)
             .unwrap_or(now_unix_ms);
-        let parent = self.active_parent_id(now_unix_ms);
 
-        // Model provenance: managed OpenHuman tier vs custom/BYO model.
-        let provider_source = if crate::openhuman::agent::cost::is_managed_tier(model) {
-            "managed"
-        } else {
-            "custom"
-        };
+        let labeled_model = format!("{provider_id}.{model}");
         let pricing = crate::openhuman::agent::cost::lookup_pricing(model);
 
         let mut attrs = BTreeMap::new();
-        attrs.insert("gen_ai.request.model".to_string(), json_str(model));
-        attrs.insert("gen_ai.provider".to_string(), json_str(provider_source));
+        attrs.insert("gen_ai.request.model".to_string(), json_str(&labeled_model));
+        attrs.insert("gen_ai.provider".to_string(), json_str(provider_id));
         attrs.insert("agent.iteration".to_string(), json_u32(iteration));
         attrs.insert(
             "gen_ai.usage.input_tokens".to_string(),
@@ -632,8 +652,12 @@ impl SpanCollector {
         );
 
         log::debug!(
-            "[agent-tracing] generation span model={model} provider={provider_source} \
-             iteration={iteration} in={input_tokens} out={output_tokens} cost_usd={cost_usd:.6}"
+            "[agent-tracing] generation span model={labeled_model} \
+             iteration={iteration} child={} in={input_tokens} out={output_tokens} \
+             cost_usd={cost_usd:.6} input_captured={} output_captured={}",
+            subagent_task_id.is_some(),
+            input.is_some(),
+            output.is_some(),
         );
         let (_, index) = self.open_span(
             SpanKind::Generation,
@@ -642,10 +666,63 @@ impl SpanCollector {
             start_unix_ms,
             attrs,
         );
+        // Captured request messages (incl. system prompt) + completion become
+        // the generation's input/output — only while content capture is on,
+        // truncated so one huge context window can't bloat the trace batch.
+        if self.ctx.capture_content {
+            if let Some(span) = self.spans.get_mut(index) {
+                if let Some(value) = input {
+                    span.input = Some(capture_model_content(value));
+                }
+                if let Some(value) = output {
+                    span.output = Some(capture_model_content(value));
+                }
+            }
+        }
         self.close_span(index, now_unix_ms, SpanStatus::Ok, BTreeMap::new());
 
+        // Child call: roll model + usage + cost onto the owning subagent span
+        // so the delegation row (e.g. `subagent.Context Scout`) natively shows
+        // which model served it and what it cost.
+        if let Some(state_index) = subagent_task_id
+            .and_then(|id| self.subagents.get(id))
+            .map(|state| state.span_index)
+        {
+            if let Some(span) = self.spans.get_mut(state_index) {
+                span.attributes
+                    .insert("gen_ai.request.model".to_string(), json_str(&labeled_model));
+                span.attributes
+                    .insert("gen_ai.provider".to_string(), json_str(provider_id));
+                for (key, add) in [
+                    ("gen_ai.usage.input_tokens", input_tokens),
+                    ("gen_ai.usage.output_tokens", output_tokens),
+                    ("gen_ai.usage.cached_input_tokens", cached_input_tokens),
+                ] {
+                    let prior = span
+                        .attributes
+                        .get(key)
+                        .and_then(serde_json::Value::as_u64)
+                        .unwrap_or(0);
+                    span.attributes
+                        .insert(key.to_string(), json_u64(prior.saturating_add(add)));
+                }
+                let prior_cost = span
+                    .attributes
+                    .get("gen_ai.usage.cost_usd")
+                    .and_then(serde_json::Value::as_f64)
+                    .unwrap_or(0.0);
+                span.attributes.insert(
+                    "gen_ai.usage.cost_usd".to_string(),
+                    json_f64(prior_cost + cost_usd),
+                );
+            }
+            return;
+        }
+
         // Root rollup for the usage dimensions the cumulative TurnCostUpdated
-        // event does not carry (reasoning / cache-creation), plus provenance.
+        // event does not carry (reasoning / cache-creation), plus provenance
+        // and the provider-labeled model (TurnCostUpdated only knows the raw
+        // model handle and can fire before the first per-call event).
         let root = match self.turn_span_index {
             Some(idx) => idx,
             None => {
@@ -655,7 +732,9 @@ impl SpanCollector {
         };
         if let Some(span) = self.spans.get_mut(root) {
             span.attributes
-                .insert("gen_ai.provider".to_string(), json_str(provider_source));
+                .insert("gen_ai.provider".to_string(), json_str(provider_id));
+            span.attributes
+                .insert("gen_ai.request.model".to_string(), json_str(&labeled_model));
             for (key, add) in [
                 ("gen_ai.usage.reasoning_tokens", reasoning_tokens),
                 ("gen_ai.usage.cache_creation_tokens", cache_creation_tokens),
@@ -739,11 +818,22 @@ impl SpanCollector {
                 call_id,
                 success,
                 output_chars,
+                output,
+                arguments,
                 elapsed_ms,
                 failure,
                 ..
             } => {
                 if let Some(index) = self.open_tools.remove(call_id) {
+                    // The tinyagents path emits `Null` arguments on the started
+                    // event and the real captured arguments on completion —
+                    // backfill the span input when it's still empty.
+                    if self.spans[index].input.is_none() {
+                        if let Some(arguments) = arguments {
+                            self.capture_tool_arguments(index, arguments);
+                        }
+                    }
+                    self.capture_tool_output(index, output);
                     let start = self.spans[index].start_unix_ms;
                     let mut extra = BTreeMap::new();
                     extra.insert(
@@ -772,6 +862,10 @@ impl SpanCollector {
 
             AgentProgress::ModelCallCompleted {
                 model,
+                provider_id,
+                subagent_task_id,
+                input,
+                output,
                 iteration,
                 input_tokens,
                 output_tokens,
@@ -782,6 +876,10 @@ impl SpanCollector {
             } => {
                 self.record_model_call(
                     model,
+                    provider_id,
+                    subagent_task_id.as_deref(),
+                    input.as_ref(),
+                    output.as_ref(),
                     *iteration,
                     *input_tokens,
                     *output_tokens,
@@ -799,6 +897,7 @@ impl SpanCollector {
                 mode,
                 dedicated_thread,
                 prompt_chars,
+                prompt,
                 display_name,
                 ..
             } => {
@@ -826,6 +925,16 @@ impl SpanCollector {
                     now_unix_ms,
                     attrs,
                 );
+                // The delegated prompt is the subagent span's input (gated +
+                // truncated like model content — scout prompts run 10k+ chars).
+                if self.ctx.capture_content && !prompt.is_empty() {
+                    if let Some(span) = self.spans.get_mut(index) {
+                        span.input = Some(serde_json::Value::String(truncate_chars(
+                            prompt,
+                            MAX_MODEL_CONTENT_CHARS,
+                        )));
+                    }
+                }
                 self.subagents.insert(
                     task_id.clone(),
                     SubagentState {
@@ -917,6 +1026,7 @@ impl SpanCollector {
                 success,
                 output_chars,
                 output,
+                arguments,
                 elapsed_ms,
                 ..
             } => {
@@ -927,6 +1037,11 @@ impl SpanCollector {
                 else {
                     return;
                 };
+                if self.spans[index].input.is_none() {
+                    if let Some(arguments) = arguments {
+                        self.capture_tool_arguments(index, arguments);
+                    }
+                }
                 self.capture_tool_output(index, output);
                 let start = self.spans[index].start_unix_ms;
                 let mut extra = BTreeMap::new();
@@ -944,6 +1059,7 @@ impl SpanCollector {
                 elapsed_ms,
                 iterations,
                 output_chars,
+                output,
                 ..
             } => {
                 let Some(state) = self.subagents.remove(task_id) else {
@@ -954,6 +1070,16 @@ impl SpanCollector {
                         self.close_span(idx, now_unix_ms, SpanStatus::Ok, BTreeMap::new());
                     }
                 }
+                // The subagent's final assistant text is the span's output
+                // (same gate + cap as its prompt input).
+                if self.ctx.capture_content && !output.is_empty() {
+                    if let Some(span) = self.spans.get_mut(state.span_index) {
+                        span.output = Some(serde_json::Value::String(truncate_chars(
+                            output,
+                            MAX_MODEL_CONTENT_CHARS,
+                        )));
+                    }
+                }
                 let start = self.spans[state.span_index].start_unix_ms;
                 let mut extra = BTreeMap::new();
                 extra.insert("subagent.iterations".to_string(), json_u32(*iterations));
@@ -1034,7 +1160,7 @@ impl SpanCollector {
                 // exporter — NDJSON file, app log, or Langfuse push — can ever
                 // serialize it. This is the single choke point; the exporters
                 // deliberately do not re-check the flag.
-                if !self.capture_content {
+                if !self.ctx.capture_content {
                     log::debug!(
                         target: "agent-tracing",
                         "[agent-tracing] TurnContent dropped at storage (capture_content=false)"
@@ -1110,6 +1236,25 @@ const MAX_TOOL_CONTENT_CHARS: usize = 4_000;
 /// Cap on captured error text (Langfuse observation `statusMessage`).
 const MAX_ERROR_MESSAGE_CHARS: usize = 500;
 
+/// Cap on captured model request/completion content and subagent
+/// prompt/output. Larger than the tool cap because a generation's input is the
+/// full message array (system prompt included) — but still bounded so a
+/// 100k-token context can't push the ingestion batch past Langfuse's event
+/// size limits.
+const MAX_MODEL_CONTENT_CHARS: usize = 25_000;
+
+/// Capture a model-payload JSON value for a span: kept structured when it
+/// serializes within [`MAX_MODEL_CONTENT_CHARS`], else degraded to a truncated
+/// string (readable in Langfuse, bounded in size).
+fn capture_model_content(value: &serde_json::Value) -> serde_json::Value {
+    let serialized = value.to_string();
+    if serialized.chars().count() <= MAX_MODEL_CONTENT_CHARS {
+        value.clone()
+    } else {
+        serde_json::Value::String(truncate_chars(&serialized, MAX_MODEL_CONTENT_CHARS))
+    }
+}
+
 /// Truncate `text` to `max` characters, appending an explicit truncation
 /// marker (with the omitted char count) when content was dropped. Returns the
 /// input unchanged when it already fits. Slices on char boundaries, so it
diff --git a/src/openhuman/agent/progress_tracing/tests.rs b/src/openhuman/agent/progress_tracing/tests.rs
index fbb8c4ab88..66ca35944e 100644
--- a/src/openhuman/agent/progress_tracing/tests.rs
+++ b/src/openhuman/agent/progress_tracing/tests.rs
@@ -88,6 +88,8 @@ fn tool_completed(
         tool_name: tool.to_string(),
         success,
         output_chars: chars,
+        output: String::new(),
+        arguments: None,
         elapsed_ms: elapsed,
         iteration: 1,
         failure: None,
@@ -237,6 +239,7 @@ fn spawn(task: &str, display: &str) -> AgentProgress {
         mode: "typed".to_string(),
         dedicated_thread: true,
         prompt_chars: 256,
+        prompt: "delegated prompt".to_string(),
         worker_thread_id: Some("worker-abc".to_string()),
         display_name: Some(display.to_string()),
     }
@@ -286,6 +289,7 @@ fn subagent_lifecycle_nests_under_the_turn() {
                 success: true,
                 output_chars: 99,
                 output: "file contents".to_string(),
+                arguments: None,
                 elapsed_ms: 40,
                 iteration: 1,
                 failure: None,
@@ -299,6 +303,7 @@ fn subagent_lifecycle_nests_under_the_turn() {
                 elapsed_ms: 500,
                 iterations: 3,
                 output_chars: 1024,
+                output: String::new(),
                 worktree_path: Some("/private/should/not/leak".to_string()),
                 changed_files: vec!["secret_file.rs".to_string()],
                 dirty_status: Some(true),
@@ -387,6 +392,7 @@ fn unknown_subagent_task_ids_are_ignored() {
             elapsed_ms: 1,
             iterations: 1,
             output_chars: 1,
+            output: String::new(),
             worktree_path: None,
             changed_files: vec![],
             dirty_status: None,
@@ -790,6 +796,7 @@ fn tool_io_is_captured_when_capture_content_is_on() {
             success: true,
             output_chars: 13,
             output: "file contents".to_string(),
+            arguments: None,
             elapsed_ms: 4,
             iteration: 1,
             failure: None,
@@ -838,6 +845,7 @@ fn tool_io_is_never_recorded_when_capture_content_is_off() {
                 success: true,
                 output_chars: 6,
                 output: "sekrit".to_string(),
+                arguments: None,
                 elapsed_ms: 4,
                 iteration: 1,
                 failure: None,
@@ -888,6 +896,10 @@ fn captured_tool_io_is_truncated_with_marker() {
 fn model_call(model: &str, reasoning: u64, cache_write: u64) -> AgentProgress {
     AgentProgress::ModelCallCompleted {
         model: model.to_string(),
+        provider_id: "managed".to_string(),
+        subagent_task_id: None,
+        input: None,
+        output: None,
         iteration: 1,
         input_tokens: 1_000,
         output_tokens: 200,
@@ -928,7 +940,11 @@ fn model_call_completed_emits_generation_span_with_usage_cost_and_pricing() {
     assert_eq!(generation.status, SpanStatus::Ok);
 
     let a = &generation.attributes;
-    assert_eq!(a["gen_ai.request.model"], serde_json::json!("agentic-v1"));
+    // Provider-labeled model: `{provider_id}.{model}`.
+    assert_eq!(
+        a["gen_ai.request.model"],
+        serde_json::json!("managed.agentic-v1")
+    );
     assert_eq!(a["gen_ai.usage.input_tokens"], serde_json::json!(1_000));
     assert_eq!(a["gen_ai.usage.output_tokens"], serde_json::json!(200));
     // Cache reads always flow, even when other calls happen to be zero.
@@ -952,16 +968,33 @@ fn model_call_completed_emits_generation_span_with_usage_cost_and_pricing() {
 
 #[test]
 fn custom_model_generation_is_stamped_custom_provenance() {
-    let mut c = collect(&[
-        (AgentProgress::TurnStarted, 0),
-        (model_call("claude-imaginary-9", 0, 0), 10),
-    ]);
+    // A BYO model rides whatever provider id the event carries ("openai",
+    // "ollama", or the "custom" default) — both on the generation and the root.
+    let event = AgentProgress::ModelCallCompleted {
+        model: "claude-imaginary-9".to_string(),
+        provider_id: "custom".to_string(),
+        subagent_task_id: None,
+        input: None,
+        output: None,
+        iteration: 1,
+        input_tokens: 10,
+        output_tokens: 2,
+        cached_input_tokens: 0,
+        cache_creation_tokens: 0,
+        reasoning_tokens: 0,
+        cost_usd: 0.0001,
+    };
+    let mut c = collect(&[(AgentProgress::TurnStarted, 0), (event, 10)]);
     c.finish(20);
     let generation = find(c.spans(), "llm.claude-imaginary-9");
     assert_eq!(
         generation.attributes["gen_ai.provider"],
         serde_json::json!("custom")
     );
+    assert_eq!(
+        generation.attributes["gen_ai.request.model"],
+        serde_json::json!("custom.claude-imaginary-9")
+    );
     // Provenance also lands on the root turn span (→ trace metadata).
     let turn = find(c.spans(), "agent.turn");
     assert_eq!(
@@ -1100,6 +1133,8 @@ fn failed_tool_records_classified_cause_only_when_capture_on() {
         tool_name: "shell".to_string(),
         success: false,
         output_chars: 0,
+        output: String::new(),
+        arguments: None,
         elapsed_ms: 5,
         iteration: 1,
         failure: Some(ClassifiedFailure {
@@ -1167,3 +1202,270 @@ fn span_ids_are_unique_across_turns() {
         "span ids must be globally unique across turns"
     );
 }
+
+// ── content-bearing wiring (system prompt / tool IO / subagent IO) ──────────
+
+fn capture_ctx() -> TraceContext {
+    ctx().with_capture_content(true)
+}
+
+fn collect_with_capture(events: &[(AgentProgress, u64)]) -> SpanCollector {
+    let mut c = SpanCollector::new(capture_ctx());
+    for (event, ts) in events {
+        c.record(event, *ts);
+    }
+    c
+}
+
+fn model_call_with_content(subagent_task_id: Option<&str>) -> AgentProgress {
+    AgentProgress::ModelCallCompleted {
+        model: "chat-v1".to_string(),
+        provider_id: "managed".to_string(),
+        subagent_task_id: subagent_task_id.map(str::to_string),
+        input: Some(serde_json::json!([
+            {"role": "system", "content": "You are OpenHuman."},
+            {"role": "user", "content": "hi"}
+        ])),
+        output: Some(serde_json::json!({"role": "assistant", "content": "hello"})),
+        iteration: 1,
+        input_tokens: 100,
+        output_tokens: 10,
+        cached_input_tokens: 0,
+        cache_creation_tokens: 0,
+        reasoning_tokens: 0,
+        cost_usd: 0.001,
+    }
+}
+
+#[test]
+fn generation_records_request_messages_and_completion_when_capture_on() {
+    let mut c = collect_with_capture(&[
+        (AgentProgress::TurnStarted, 0),
+        (model_call_with_content(None), 10),
+    ]);
+    c.finish(20);
+    let generation = find(c.spans(), "llm.chat-v1");
+    let input = generation.input.as_ref().expect("generation input");
+    assert!(
+        input.to_string().contains("You are OpenHuman."),
+        "system prompt must land in the generation input: {input}"
+    );
+    assert!(generation
+        .output
+        .as_ref()
+        .expect("generation output")
+        .to_string()
+        .contains("hello"));
+}
+
+#[test]
+fn generation_withholds_content_when_capture_off() {
+    let mut c = collect(&[
+        (AgentProgress::TurnStarted, 0),
+        (model_call_with_content(None), 10),
+    ]);
+    c.finish(20);
+    let generation = find(c.spans(), "llm.chat-v1");
+    assert!(generation.input.is_none(), "capture off → no prompt");
+    assert!(generation.output.is_none(), "capture off → no completion");
+}
+
+#[test]
+fn subagent_model_call_nests_generation_and_stamps_model_on_subagent_span() {
+    let mut c = collect_with_capture(&[
+        (AgentProgress::TurnStarted, 0),
+        (spawn("task-9", "Context Scout"), 5),
+        (
+            AgentProgress::SubagentIterationStarted {
+                agent_id: "context_scout".to_string(),
+                task_id: "task-9".to_string(),
+                iteration: 1,
+                max_iterations: 8,
+                extended_policy: true,
+            },
+            6,
+        ),
+        (model_call_with_content(Some("task-9")), 10),
+    ]);
+    c.finish(20);
+    let spans = c.spans();
+
+    // Generation nests under the subagent's iteration, not the parent turn.
+    let generation = find(spans, "llm.chat-v1");
+    let child_iter = find(spans, "subagent.iteration#1");
+    assert_eq!(
+        generation.parent_span_id.as_deref(),
+        Some(child_iter.span_id.as_str())
+    );
+    assert!(generation.input.is_some(), "child generation carries input");
+
+    // The subagent span itself surfaces the provider-labeled model + usage.
+    let sub = find(spans, "subagent.Context Scout");
+    assert_eq!(
+        sub.attributes["gen_ai.request.model"],
+        serde_json::json!("managed.chat-v1")
+    );
+    assert_eq!(
+        sub.attributes["gen_ai.usage.input_tokens"],
+        serde_json::json!(100)
+    );
+    assert_eq!(
+        sub.attributes["gen_ai.usage.cost_usd"],
+        serde_json::json!(0.001)
+    );
+
+    // The parent turn's rollup is NOT polluted by the child call.
+    let turn = find(spans, "agent.turn");
+    assert!(turn.attributes.get("gen_ai.request.model").is_none());
+}
+
+#[test]
+fn parent_tool_completion_backfills_arguments_and_records_output() {
+    let mut c = collect_with_capture(&[
+        (AgentProgress::TurnStarted, 0),
+        (
+            // tinyagents path: Started carries Null arguments.
+            AgentProgress::ToolCallStarted {
+                call_id: "c1".to_string(),
+                tool_name: "web_search".to_string(),
+                arguments: serde_json::Value::Null,
+                iteration: 1,
+                display_label: None,
+                display_detail: None,
+            },
+            5,
+        ),
+        (
+            AgentProgress::ToolCallCompleted {
+                call_id: "c1".to_string(),
+                tool_name: "web_search".to_string(),
+                success: true,
+                output_chars: 7,
+                output: "results".to_string(),
+                arguments: Some(serde_json::json!({"query": "weather"})),
+                elapsed_ms: 40,
+                iteration: 1,
+                failure: None,
+            },
+            45,
+        ),
+    ]);
+    c.finish(50);
+    let tool = find(c.spans(), "tool.web_search");
+    assert!(
+        tool.input
+            .as_ref()
+            .expect("tool input backfilled from completion")
+            .to_string()
+            .contains("weather"),
+        "arguments from the completion event must backfill the span input"
+    );
+    assert_eq!(
+        tool.output,
+        Some(serde_json::Value::String("results".to_string()))
+    );
+}
+
+#[test]
+fn subagent_span_records_prompt_and_final_output_when_capture_on() {
+    let mut c = collect_with_capture(&[
+        (AgentProgress::TurnStarted, 0),
+        (spawn("task-1", "Researcher"), 5),
+        (
+            AgentProgress::SubagentCompleted {
+                agent_id: "researcher".to_string(),
+                task_id: "task-1".to_string(),
+                elapsed_ms: 100,
+                iterations: 2,
+                output_chars: 12,
+                output: "final answer".to_string(),
+                worktree_path: None,
+                changed_files: vec![],
+                dirty_status: None,
+            },
+            105,
+        ),
+    ]);
+    c.finish(110);
+    let sub = find(c.spans(), "subagent.Researcher");
+    assert_eq!(
+        sub.input,
+        Some(serde_json::Value::String("delegated prompt".to_string()))
+    );
+    assert_eq!(
+        sub.output,
+        Some(serde_json::Value::String("final answer".to_string()))
+    );
+}
+
+#[test]
+fn subagent_content_is_withheld_when_capture_off() {
+    let mut c = collect(&[
+        (AgentProgress::TurnStarted, 0),
+        (spawn("task-1", "Researcher"), 5),
+        (
+            AgentProgress::SubagentCompleted {
+                agent_id: "researcher".to_string(),
+                task_id: "task-1".to_string(),
+                elapsed_ms: 100,
+                iterations: 2,
+                output_chars: 12,
+                output: "final answer".to_string(),
+                worktree_path: None,
+                changed_files: vec![],
+                dirty_status: None,
+            },
+            105,
+        ),
+    ]);
+    c.finish(110);
+    let sub = find(c.spans(), "subagent.Researcher");
+    assert!(sub.input.is_none());
+    assert!(sub.output.is_none());
+}
+
+#[test]
+fn oversized_model_content_degrades_to_truncated_string() {
+    let big = "x".repeat(MAX_MODEL_CONTENT_CHARS + 100);
+    let captured = capture_model_content(&serde_json::json!({ "content": big }));
+    let rendered = match &captured {
+        serde_json::Value::String(s) => s.clone(),
+        other => other.to_string(),
+    };
+    assert!(rendered.chars().count() <= MAX_MODEL_CONTENT_CHARS + 64);
+    assert!(rendered.contains("truncated"));
+}
+
+#[test]
+fn turn_content_respects_the_trace_context_capture_gate() {
+    // Regression (PR #4506 review): the collector briefly carried TWO capture
+    // gates — a collector-level flag (checked by the TurnContent arm) and the
+    // TraceContext flag (checked everywhere else). The web progress bridge only
+    // sets the TraceContext flag, so TurnContent silently dropped the turn's
+    // prompt/reply even with capture_content enabled. There is now a single
+    // gate: both construction styles must attach TurnContent.
+    for collector in [
+        SpanCollector::new(ctx().with_capture_content(true)),
+        SpanCollector::new(ctx()).with_content_capture(true),
+    ] {
+        let mut c = collector;
+        c.record(&AgentProgress::TurnStarted, 0);
+        c.record(
+            &AgentProgress::TurnContent {
+                input: Some("the prompt".to_string()),
+                output: Some("the reply".to_string()),
+            },
+            5,
+        );
+        c.finish(10);
+        let turn = find(c.spans(), "agent.turn");
+        assert_eq!(
+            turn.input,
+            Some(serde_json::Value::String("the prompt".to_string()))
+        );
+        assert_eq!(
+            turn.output,
+            Some(serde_json::Value::String("the reply".to_string()))
+        );
+    }
+}
diff --git a/src/openhuman/agent_orchestration/ops.rs b/src/openhuman/agent_orchestration/ops.rs
index 614b182dc8..a898fb37bd 100644
--- a/src/openhuman/agent_orchestration/ops.rs
+++ b/src/openhuman/agent_orchestration/ops.rs
@@ -449,6 +449,7 @@ impl AgentOrchestrationSession {
                     mode: "typed".to_string(),
                     dedicated_thread: false,
                     prompt_chars: prompt.chars().count(),
+                    prompt: prompt.clone(),
                     worker_thread_id: None,
                     display_name: resolved_display_name,
                 })
@@ -554,6 +555,7 @@ impl AgentOrchestrationSession {
                                 elapsed_ms: outcome.elapsed.as_millis() as u64,
                                 iterations: outcome.iterations as u32,
                                 output_chars: outcome.output.chars().count(),
+                                output: outcome.output.clone(),
                                 worktree_path: None,
                                 changed_files: Vec::new(),
                                 dirty_status: None,
diff --git a/src/openhuman/agent_orchestration/spawn_parallel_graph.rs b/src/openhuman/agent_orchestration/spawn_parallel_graph.rs
index 94b44a24f3..09fd3c1a33 100644
--- a/src/openhuman/agent_orchestration/spawn_parallel_graph.rs
+++ b/src/openhuman/agent_orchestration/spawn_parallel_graph.rs
@@ -701,7 +701,7 @@ async fn stage_spawn_parallel_workers_from_defs(
             progress_sink,
             &definition,
             &task_id,
-            prompt.chars().count(),
+            &prompt,
             task.ownership
                 .as_deref()
                 .map(str::trim)
@@ -968,9 +968,10 @@ async fn project_spawn_parallel_spawned(
     progress_sink: Option<&Sender<AgentProgress>>,
     definition: &AgentDefinition,
     task_id: &str,
-    prompt_chars: usize,
+    prompt: &str,
     has_ownership: bool,
 ) {
+    let prompt_chars = prompt.chars().count();
     tracing::debug!(
         parent_session = %parent_session,
         task_id = %task_id,
@@ -994,6 +995,7 @@ async fn project_spawn_parallel_spawned(
                 mode: "typed".to_string(),
                 dedicated_thread: false,
                 prompt_chars,
+                prompt: prompt.to_string(),
                 worker_thread_id: None,
                 display_name: Some(definition.display_name().to_string()),
             })
@@ -1052,6 +1054,7 @@ async fn project_spawn_parallel_result(
                         elapsed_ms: *elapsed_ms,
                         iterations: *iterations,
                         output_chars: output.as_ref().map(|s| s.chars().count()).unwrap_or(0),
+                        output: output.clone().unwrap_or_default(),
                         worktree_path: worktree_path.clone(),
                         changed_files: changed_files.clone(),
                         dirty_status: *dirty_status,
diff --git a/src/openhuman/agent_orchestration/tools/agent_prepare_context.rs b/src/openhuman/agent_orchestration/tools/agent_prepare_context.rs
index dfa020e8b4..6ce07d9029 100644
--- a/src/openhuman/agent_orchestration/tools/agent_prepare_context.rs
+++ b/src/openhuman/agent_orchestration/tools/agent_prepare_context.rs
@@ -229,6 +229,7 @@ async fn run_context_scout_with_catalog_and_workspace(
                 mode: "typed".to_string(),
                 dedicated_thread: false,
                 prompt_chars: scout_prompt.chars().count(),
+                prompt: scout_prompt.clone(),
                 worker_thread_id: None,
                 display_name: Some(definition.display_name().to_string()),
             })
@@ -288,6 +289,7 @@ async fn run_context_scout_with_catalog_and_workspace(
                                 elapsed_ms: outcome.elapsed.as_millis() as u64,
                                 iterations: outcome.iterations as u32,
                                 output_chars: 0,
+                                output: String::new(),
                                 worktree_path: None,
                                 changed_files: Vec::new(),
                                 dirty_status: None,
@@ -327,6 +329,7 @@ async fn run_context_scout_with_catalog_and_workspace(
                             elapsed_ms: outcome.elapsed.as_millis() as u64,
                             iterations: outcome.iterations as u32,
                             output_chars: bundle.chars().count(),
+                            output: bundle.clone(),
                             worktree_path: None,
                             changed_files: Vec::new(),
                             dirty_status: None,
@@ -412,6 +415,7 @@ async fn run_context_scout_with_catalog_and_workspace(
                             elapsed_ms: outcome.elapsed.as_millis() as u64,
                             iterations: outcome.iterations as u32,
                             output_chars: 0,
+                            output: String::new(),
                             worktree_path: None,
                             changed_files: Vec::new(),
                             dirty_status: None,
@@ -450,6 +454,7 @@ async fn run_context_scout_with_catalog_and_workspace(
                             elapsed_ms: outcome.elapsed.as_millis() as u64,
                             iterations: outcome.iterations as u32,
                             output_chars: 0,
+                            output: String::new(),
                             worktree_path: None,
                             changed_files: Vec::new(),
                             dirty_status: None,
diff --git a/src/openhuman/agent_orchestration/tools/continue_subagent.rs b/src/openhuman/agent_orchestration/tools/continue_subagent.rs
index a14fc452bb..fefcf59e42 100644
--- a/src/openhuman/agent_orchestration/tools/continue_subagent.rs
+++ b/src/openhuman/agent_orchestration/tools/continue_subagent.rs
@@ -222,6 +222,7 @@ impl Tool for ContinueSubagentTool {
                     mode: "typed".to_string(),
                     dedicated_thread: false,
                     prompt_chars: message.chars().count(),
+                    prompt: message.to_string(),
                     worker_thread_id: checkpoint.worker_thread_id.clone(),
                     display_name: definition.display_name.clone(),
                 })
@@ -328,6 +329,7 @@ impl Tool for ContinueSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
@@ -372,6 +374,7 @@ impl Tool for ContinueSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
diff --git a/src/openhuman/agent_orchestration/tools/dispatch.rs b/src/openhuman/agent_orchestration/tools/dispatch.rs
index 384b57a952..be577eb465 100644
--- a/src/openhuman/agent_orchestration/tools/dispatch.rs
+++ b/src/openhuman/agent_orchestration/tools/dispatch.rs
@@ -114,6 +114,7 @@ pub(crate) async fn dispatch_subagent(
                 mode: "typed".to_string(),
                 dedicated_thread: false,
                 prompt_chars: prompt.chars().count(),
+                prompt: prompt.to_string(),
                 worker_thread_id: None,
                 display_name: Some(definition.display_name().to_string()),
             })
diff --git a/src/openhuman/agent_orchestration/tools/spawn_async_subagent.rs b/src/openhuman/agent_orchestration/tools/spawn_async_subagent.rs
index 148f945bd6..55433fd134 100644
--- a/src/openhuman/agent_orchestration/tools/spawn_async_subagent.rs
+++ b/src/openhuman/agent_orchestration/tools/spawn_async_subagent.rs
@@ -445,6 +445,7 @@ impl Tool for SpawnAsyncSubagentTool {
                     mode: "async".to_string(),
                     dedicated_thread: worker_thread_id.is_some(),
                     prompt_chars: prompt.chars().count(),
+                    prompt: prompt.clone(),
                     worker_thread_id: worker_thread_id.clone(),
                     display_name: Some(definition.display_name().to_string()),
                 })
@@ -567,6 +568,7 @@ impl Tool for SpawnAsyncSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
@@ -626,6 +628,7 @@ impl Tool for SpawnAsyncSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
diff --git a/src/openhuman/agent_orchestration/tools/spawn_subagent.rs b/src/openhuman/agent_orchestration/tools/spawn_subagent.rs
index cbf9b85e33..a90f57556b 100644
--- a/src/openhuman/agent_orchestration/tools/spawn_subagent.rs
+++ b/src/openhuman/agent_orchestration/tools/spawn_subagent.rs
@@ -493,6 +493,7 @@ impl Tool for SpawnSubagentTool {
                     mode: "typed".to_string(),
                     dedicated_thread,
                     prompt_chars: prompt.chars().count(),
+                    prompt: prompt.clone(),
                     worker_thread_id: worker_thread_id.clone(),
                     display_name: Some(definition.display_name().to_string()),
                 })
@@ -582,6 +583,7 @@ impl Tool for SpawnSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
@@ -653,6 +655,7 @@ impl Tool for SpawnSubagentTool {
                                     elapsed_ms: outcome.elapsed.as_millis() as u64,
                                     iterations: outcome.iterations as u32,
                                     output_chars: outcome.output.chars().count(),
+                                    output: outcome.output.clone(),
                                     worktree_path: None,
                                     changed_files: Vec::new(),
                                     dirty_status: None,
diff --git a/src/openhuman/channels/providers/web/progress_bridge.rs b/src/openhuman/channels/providers/web/progress_bridge.rs
index 3071197a93..296a472c95 100644
--- a/src/openhuman/channels/providers/web/progress_bridge.rs
+++ b/src/openhuman/channels/providers/web/progress_bridge.rs
@@ -113,6 +113,22 @@ fn subagent_worktree_detail(
     }
 }
 
+/// Trace user attribution for a turn whose `auth_get_me` cache is cold
+/// (headless / autonomous / freshly booted cores): read the on-disk
+/// app-session profile and return the user's email (preferred) or backend
+/// user id. `None` when signed out or the profile is unreadable — the caller
+/// then falls back to the transport client id.
+fn session_profile_user_attribution(config: &crate::openhuman::config::Config) -> Option<String> {
+    let state = crate::openhuman::credentials::session_support::build_session_state(config).ok()?;
+    state
+        .user
+        .as_ref()
+        .and_then(|u| u.get("email"))
+        .and_then(serde_json::Value::as_str)
+        .map(str::to_string)
+        .or(state.user_id)
+}
+
 /// Spawn a background task that reads [`AgentProgress`] events from the
 /// agent turn loop and translates them into [`WebChannelEvent`]s tagged
 /// with the correct client/thread/request IDs. The task runs until the
@@ -175,6 +191,7 @@ pub(crate) fn spawn_progress_bridge(
             let user_attributed = identity.is_some();
             let user_id = identity
                 .and_then(|i| i.id.or(i.email))
+                .or_else(|| session_profile_user_attribution(&config))
                 .unwrap_or_else(|| client_id.clone());
             // Run origin for trace metadata: the request's source tag
             // ("ptt"/"dictation"/"type"/"agentbox"/"autonomous"/…), else a
@@ -456,6 +473,7 @@ pub(crate) fn spawn_progress_bridge(
                     elapsed_ms,
                     iteration,
                     failure,
+                    ..
                 } => {
                     // Serialize the classified failure (if any) for the UI + ledger.
                     let failure_json = failure.as_ref().and_then(|f| serde_json::to_value(f).ok());
@@ -501,6 +519,7 @@ pub(crate) fn spawn_progress_bridge(
                     prompt_chars,
                     worker_thread_id,
                     display_name,
+                    ..
                 } => {
                     let label = display_name.as_deref().unwrap_or(&agent_id);
                     let kind = if worker_thread_id.is_some() {
@@ -585,6 +604,7 @@ pub(crate) fn spawn_progress_bridge(
                     worktree_path,
                     changed_files,
                     dirty_status,
+                    ..
                 } => {
                     let completed_at = chrono::Utc::now();
                     ledger_upsert_agent_run(
@@ -901,6 +921,7 @@ pub(crate) fn spawn_progress_bridge(
                     elapsed_ms,
                     iteration,
                     failure,
+                    ..
                 } => {
                     // Serialize the classified failure (if any) so a failed
                     // sub-agent tool row carries its "why + next" copy on the
@@ -1214,6 +1235,52 @@ pub(crate) fn spawn_progress_bridge(
 
 #[cfg(test)]
 mod tests {
+    use super::session_profile_user_attribution;
+
+    #[test]
+    fn session_profile_attribution_none_when_signed_out() {
+        let tmp = tempfile::TempDir::new().unwrap();
+        let config = crate::openhuman::config::Config {
+            workspace_dir: tmp.path().join("workspace"),
+            action_dir: tmp.path().join("workspace"),
+            config_path: tmp.path().join("config.toml"),
+            ..Default::default()
+        };
+        assert!(session_profile_user_attribution(&config).is_none());
+    }
+
+    #[test]
+    fn session_profile_attribution_prefers_email_from_stored_session() {
+        let tmp = tempfile::TempDir::new().unwrap();
+        let config = crate::openhuman::config::Config {
+            workspace_dir: tmp.path().join("workspace"),
+            action_dir: tmp.path().join("workspace"),
+            config_path: tmp.path().join("config.toml"),
+            ..Default::default()
+        };
+        let service = crate::openhuman::credentials::AuthService::from_config(&config);
+        let mut metadata = std::collections::HashMap::new();
+        metadata.insert(
+            "user_json".to_string(),
+            "{\"email\": \"steven@example.test\", \"_id\": \"u-1\"}".to_string(),
+        );
+        metadata.insert("user_id".to_string(), "u-1".to_string());
+        service
+            .store_provider_token(
+                crate::openhuman::credentials::APP_SESSION_PROVIDER,
+                crate::openhuman::credentials::DEFAULT_AUTH_PROFILE_NAME,
+                "session-token",
+                metadata,
+                true,
+            )
+            .expect("store session profile");
+        assert_eq!(
+            session_profile_user_attribution(&config).as_deref(),
+            Some("steven@example.test"),
+            "cold-cache attribution must resolve the on-disk session email"
+        );
+    }
+
     use super::*;
 
     #[test]
diff --git a/src/openhuman/inference/provider/claude_code/mod.rs b/src/openhuman/inference/provider/claude_code/mod.rs
index 023bf60872..9697ce98f9 100644
--- a/src/openhuman/inference/provider/claude_code/mod.rs
+++ b/src/openhuman/inference/provider/claude_code/mod.rs
@@ -206,6 +206,10 @@ fn thread_key_from_messages(messages: &[ChatMessage]) -> String {
 
 #[async_trait]
 impl Provider for ClaudeCodeProvider {
+    fn telemetry_provider_id(&self) -> String {
+        "claude-code".to_string()
+    }
+
     fn capabilities(&self) -> ProviderCapabilities {
         ProviderCapabilities {
             native_tool_calling: true,
diff --git a/src/openhuman/inference/provider/compatible_provider_impl.rs b/src/openhuman/inference/provider/compatible_provider_impl.rs
index 64313bfb38..a88ac85ac0 100644
--- a/src/openhuman/inference/provider/compatible_provider_impl.rs
+++ b/src/openhuman/inference/provider/compatible_provider_impl.rs
@@ -16,6 +16,12 @@ use super::{AuthStyle, OpenAiCompatibleProvider};
 
 #[async_trait]
 impl Provider for OpenAiCompatibleProvider {
+    fn telemetry_provider_id(&self) -> String {
+        // The configured provider slug ("openai", "groq", "venice", ...),
+        // normalized for stable telemetry labels.
+        self.name.trim().to_ascii_lowercase().replace(' ', "-")
+    }
+
     fn capabilities(&self) -> crate::openhuman::inference::provider::traits::ProviderCapabilities {
         crate::openhuman::inference::provider::traits::ProviderCapabilities {
             native_tool_calling: self.native_tool_calling,
diff --git a/src/openhuman/inference/provider/openhuman_backend.rs b/src/openhuman/inference/provider/openhuman_backend.rs
index d49586e952..3892afa9df 100644
--- a/src/openhuman/inference/provider/openhuman_backend.rs
+++ b/src/openhuman/inference/provider/openhuman_backend.rs
@@ -127,6 +127,10 @@ impl OpenHumanBackendProvider {
 
 #[async_trait]
 impl Provider for OpenHumanBackendProvider {
+    fn telemetry_provider_id(&self) -> String {
+        "managed".to_string()
+    }
+
     fn capabilities(&self) -> ProviderCapabilities {
         ProviderCapabilities {
             native_tool_calling: true,
diff --git a/src/openhuman/inference/provider/reliable.rs b/src/openhuman/inference/provider/reliable.rs
index 411c2eb6cf..822b1c7f03 100644
--- a/src/openhuman/inference/provider/reliable.rs
+++ b/src/openhuman/inference/provider/reliable.rs
@@ -133,6 +133,15 @@ impl ReliableProvider {
 
 #[async_trait]
 impl Provider for ReliableProvider {
+    fn telemetry_provider_id(&self) -> String {
+        // Delegate to the primary (first) upstream - the one that serves the
+        // call unless a failover kicks in.
+        self.providers
+            .first()
+            .map(|(_, p)| p.telemetry_provider_id())
+            .unwrap_or_else(|| "custom".to_string())
+    }
+
     async fn warmup(&self) -> anyhow::Result<()> {
         for (name, provider) in &self.providers {
             tracing::info!(provider = name, "Warming up provider connection pool");
diff --git a/src/openhuman/inference/provider/router.rs b/src/openhuman/inference/provider/router.rs
index 38fb7ee41a..f4d46ace92 100644
--- a/src/openhuman/inference/provider/router.rs
+++ b/src/openhuman/inference/provider/router.rs
@@ -164,6 +164,13 @@ impl RouterProvider {
 
 #[async_trait]
 impl Provider for RouterProvider {
+    fn telemetry_provider_id(&self) -> String {
+        self.providers
+            .get(self.default_index)
+            .map(|(_, p)| p.telemetry_provider_id())
+            .unwrap_or_else(|| "custom".to_string())
+    }
+
     async fn chat_with_system(
         &self,
         system_prompt: Option<&str>,
diff --git a/src/openhuman/inference/provider/traits.rs b/src/openhuman/inference/provider/traits.rs
index 5594963c76..21e50eff01 100644
--- a/src/openhuman/inference/provider/traits.rs
+++ b/src/openhuman/inference/provider/traits.rs
@@ -421,6 +421,17 @@ fn format_prompt_messages(messages: &[ChatMessage]) -> String {
 
 #[async_trait]
 pub trait Provider: Send + Sync {
+    /// Stable provider identifier for telemetry/tracing. Rendered by trace
+    /// exporters as the Langfuse `gen_ai.provider` and the `{provider}.{model}`
+    /// model label (e.g. `managed.chat-v1`, `openai.gpt-4o`).
+    ///
+    /// Defaults to `"custom"`; concrete providers override with their slug
+    /// (the managed backend returns `"managed"`, an OpenAI-compatible BYOK
+    /// provider its configured name, wrappers delegate to their active inner).
+    fn telemetry_provider_id(&self) -> String {
+        "custom".to_string()
+    }
+
     /// Query provider capabilities.
     ///
     /// Default implementation returns minimal capabilities (no native tool calling).
diff --git a/src/openhuman/routing/provider.rs b/src/openhuman/routing/provider.rs
index d26f733edb..6794f3c4c5 100644
--- a/src/openhuman/routing/provider.rs
+++ b/src/openhuman/routing/provider.rs
@@ -377,6 +377,12 @@ impl IntelligentRoutingProvider {
 
 #[async_trait]
 impl Provider for IntelligentRoutingProvider {
+    fn telemetry_provider_id(&self) -> String {
+        // Attribute to the remote provider; local-routing decisions are
+        // per-call and the remote is the configured default.
+        self.remote.telemetry_provider_id()
+    }
+
     fn capabilities(&self) -> ProviderCapabilities {
         self.remote.capabilities()
     }
diff --git a/src/openhuman/threads/turn_state/mirror_tests.rs b/src/openhuman/threads/turn_state/mirror_tests.rs
index 04ab9d6e80..04f72814ea 100644
--- a/src/openhuman/threads/turn_state/mirror_tests.rs
+++ b/src/openhuman/threads/turn_state/mirror_tests.rs
@@ -128,6 +128,8 @@ fn tool_call_start_and_complete_track_timeline() {
         tool_name: "shell".into(),
         success: true,
         output_chars: 12,
+        output: String::new(),
+        arguments: None,
         elapsed_ms: 50,
         iteration: 1,
         failure: None,
@@ -202,6 +204,8 @@ fn tool_call_started_reuses_args_delta_placeholder_for_same_call_id() {
         tool_name: "shell".into(),
         success: true,
         output_chars: 1,
+        output: String::new(),
+        arguments: None,
         elapsed_ms: 5,
         iteration: 1,
         failure: None,
@@ -314,6 +318,7 @@ fn subagent_lifecycle_records_and_clears_active() {
         mode: "typed".into(),
         dedicated_thread: false,
         prompt_chars: 42,
+        prompt: String::new(),
         worker_thread_id: None,
         display_name: Some("Researcher".into()),
     });
@@ -344,6 +349,7 @@ fn subagent_lifecycle_records_and_clears_active() {
         elapsed_ms: 1234,
         iterations: 2,
         output_chars: 80,
+        output: String::new(),
         worktree_path: None,
         changed_files: Vec::new(),
         dirty_status: None,
@@ -366,6 +372,7 @@ fn subagent_transcript_persists_interleaved_prose_and_tools() {
         mode: "typed".into(),
         dedicated_thread: false,
         prompt_chars: 10,
+        prompt: String::new(),
         worker_thread_id: None,
         display_name: Some("Researcher".into()),
     });
@@ -409,6 +416,7 @@ fn subagent_transcript_persists_interleaved_prose_and_tools() {
         success: true,
         output_chars: 5,
         output: String::new(),
+        arguments: None,
         elapsed_ms: 12,
         iteration: 1,
         failure: None,
diff --git a/src/openhuman/tinyagents/journal.rs b/src/openhuman/tinyagents/journal.rs
index c7b1552ec7..aa057676f1 100644
--- a/src/openhuman/tinyagents/journal.rs
+++ b/src/openhuman/tinyagents/journal.rs
@@ -419,8 +419,12 @@ mod tests {
         let journal: Arc<dyn HarnessEventJournal> =
             Arc::new(StoreEventJournal::new(stores.journal));
         let sink = EventSink::with_stream_id(run_id.as_str());
-        let journal_sink = JournalSink::new(journal, run_id.clone());
-        let redacting = RedactingSink::new(Arc::new(journal_sink), vec!["sk-super-secret".into()]);
+        // Keep a handle to the JournalSink: persistence became asynchronous
+        // (background `AppendWorker` drain, tinyagents v1.5 audit remediation),
+        // so the test must `flush()` before reading the journal back — exactly
+        // the contract the crate documents for read-after-write.
+        let journal_sink = Arc::new(JournalSink::new(journal, run_id.clone()));
+        let redacting = RedactingSink::new(journal_sink.clone(), vec!["sk-super-secret".into()]);
         sink.subscribe(Arc::new(FanOutSink::new().with(Arc::new(redacting))));
 
         sink.emit(AgentEvent::ModelStarted {
@@ -431,6 +435,9 @@ mod tests {
             call_id: "c1".into(),
             tool_name: "echo".to_string(),
         });
+        // Drain the async persistence worker so the durable log has caught up
+        // (flush blocks on the drain thread's ack, not on this runtime).
+        journal_sink.flush();
 
         // Reconstruct from the durable store alone.
         let replayed = read_run_events_at(&tmp, run_id.as_str(), 0).await;
diff --git a/src/openhuman/tinyagents/mod.rs b/src/openhuman/tinyagents/mod.rs
index c1df7d9d33..38d6a172eb 100644
--- a/src/openhuman/tinyagents/mod.rs
+++ b/src/openhuman/tinyagents/mod.rs
@@ -157,6 +157,16 @@ fn run_policy_for(max_iterations: usize, response_cache_enabled: bool) -> RunPol
     // pass `false` here AND attach no cache, so a live user turn can never be
     // served a cached model response (double fail-safe).
     policy.cache.response_cache_enabled = response_cache_enabled;
+    // Payload capture ON: the loop stamps request messages + completion onto
+    // `ModelCompleted` and tool arguments + result onto `ToolCompleted`, which
+    // the `OpenhumanEventBridge` projects into content-bearing `AgentProgress`
+    // events (generation/tool span input+output in trace exports). Privacy
+    // posture is unchanged off-device: the durable journal passes through a
+    // `RedactingSink` (on-device, same data class as the threads DB, which
+    // already persists full conversations + tool output), and the Langfuse
+    // exporter withholds all content unless
+    // `observability.agent_tracing.capture_content` is on.
+    policy.capture = tinyagents::harness::runtime::PayloadCapture::all();
     policy
 }
 
@@ -450,6 +460,10 @@ pub(crate) async fn run_turn_via_tinyagents_shared(
     // otherwise the harness model-call cap would be zero and abort the run before
     // the first provider call.
     let max_iterations = effective_max_iterations(max_iterations);
+    // Snapshot the provider's telemetry id before `provider` moves into the
+    // harness assembly — the event bridge stamps it on every per-call
+    // generation event (`{provider_id}.{model}` in Langfuse).
+    let provider_id = provider.telemetry_provider_id();
     let AssembledTurnHarness {
         harness,
         cursor,
@@ -645,6 +659,7 @@ pub(crate) async fn run_turn_via_tinyagents_shared(
         let bridge = OpenhumanEventBridge::with_scope(
             on_progress,
             model,
+            provider_id.clone(),
             max_iterations,
             subagent_scope.clone(),
             cursor.clone(),
diff --git a/src/openhuman/tinyagents/observability.rs b/src/openhuman/tinyagents/observability.rs
index 6cd3e4c732..912a64e903 100644
--- a/src/openhuman/tinyagents/observability.rs
+++ b/src/openhuman/tinyagents/observability.rs
@@ -143,11 +143,27 @@ struct BridgeState {
     cache_misses: u64,
 }
 
+/// Per-model-call figures `record_usage` resolved from the provider-usage
+/// carry (charged>estimate cost precedence + cache/reasoning breakdown),
+/// keyed by iteration so the subsequent `ModelCompleted` projection reports
+/// the same numbers as the wallet accounting.
+#[derive(Clone, Copy, Debug)]
+struct ResolvedCallFigures {
+    cost_usd: f64,
+    cache_creation_tokens: u64,
+    reasoning_tokens: u64,
+}
+
 /// An [`EventListener`] that mirrors harness events onto openhuman's progress
 /// sink and cost tracker.
 pub(crate) struct OpenhumanEventBridge {
     on_progress: Option<Sender<AgentProgress>>,
     model: String,
+    /// Telemetry provider id (`"managed"`, `"openai"`, …) — from
+    /// [`Provider::telemetry_provider_id`](crate::openhuman::inference::provider::Provider::telemetry_provider_id).
+    /// Rides on `ModelCallCompleted` so trace exporters render the Langfuse
+    /// model as `{provider_id}.{model}`.
+    provider_id: String,
     max_iterations: u32,
     /// `None` for a parent turn; `Some` to emit child-scoped `Subagent*` events.
     scope: Option<SubagentScope>,
@@ -175,6 +191,13 @@ pub(crate) struct OpenhumanEventBridge {
     /// iteration cursor, bumped once per `ModelStarted`) so a given call's usage
     /// is recorded exactly once. See [`OpenhumanEventBridge::record_usage`].
     recorded_iterations: Mutex<std::collections::HashSet<u32>>,
+    /// Per-iteration figures resolved by `record_usage` (see
+    /// [`ResolvedCallFigures`]); taken by the `ModelCompleted` arm.
+    resolved_calls: Mutex<std::collections::HashMap<u32, ResolvedCallFigures>>,
+    /// `call_id → start instant` for in-flight tool calls, written on
+    /// `ToolStarted` and taken on `ToolCompleted` so the projected completion
+    /// event carries a real `elapsed_ms` (the crate event has no timing).
+    tool_started_at: Mutex<std::collections::HashMap<String, std::time::Instant>>,
     state: Mutex<BridgeState>,
     /// Ordered overflow buffer for progress events that hit backpressure
     /// (channel `Full`). Once ANY event spills here, `draining` stays set and
@@ -204,6 +227,7 @@ impl OpenhumanEventBridge {
         Self::with_scope(
             on_progress,
             model,
+            "custom",
             max_iterations,
             None,
             Arc::default(),
@@ -219,6 +243,7 @@ impl OpenhumanEventBridge {
     pub(crate) fn with_scope(
         on_progress: Option<Sender<AgentProgress>>,
         model: impl Into<String>,
+        provider_id: impl Into<String>,
         max_iterations: usize,
         scope: Option<SubagentScope>,
         cursor: IterationCursor,
@@ -229,6 +254,7 @@ impl OpenhumanEventBridge {
         Arc::new(Self {
             on_progress,
             model: model.into(),
+            provider_id: provider_id.into(),
             max_iterations: max_iterations as u32,
             scope,
             cursor,
@@ -236,6 +262,8 @@ impl OpenhumanEventBridge {
             failure_map,
             usage_carry,
             recorded_iterations: Mutex::new(std::collections::HashSet::new()),
+            resolved_calls: Mutex::new(std::collections::HashMap::new()),
+            tool_started_at: Mutex::new(std::collections::HashMap::new()),
             state: Mutex::new(BridgeState::default()),
             overflow: Arc::default(),
         })
@@ -387,16 +415,13 @@ impl OpenhumanEventBridge {
             .unwrap_or_else(|p| p.into_inner())
             .pop_front();
 
-        // Estimate from catalogued per-MTok rates as the floor; prefer the
-        // provider's own charged amount when it reported one (charged > estimate
-        // precedence — restores the legacy observer's behaviour, so credit-metered
-        // backends surface real billing rather than a token-rate estimate).
-        let estimate = crate::openhuman::cost::catalog::estimate_cost_usd(
-            &self.model,
-            usage.input_tokens,
-            usage.output_tokens,
-            usage.cache_read_tokens,
-        );
+        // Estimate as the floor via the tier-aware `agent::cost` table (managed
+        // handles like `chat-v1`/`burst-v1` + the vendor catalog + heuristics —
+        // the catalog-only lookup priced every managed-tier call as $0); prefer
+        // the provider's own charged amount when it reported one (charged >
+        // estimate precedence, so credit-metered backends surface real billing
+        // rather than a token-rate estimate).
+        let estimate = Self::estimate_call_cost(&self.model, usage);
         let call_cost = carried
             .as_ref()
             .map(|u| u.charged_amount_usd)
@@ -435,6 +460,21 @@ impl OpenhumanEventBridge {
             context_window,
             "[cost] recording per-call usage (charged>estimate precedence via provider carry)"
         );
+        // Stash the resolved per-call figures so the `ModelCompleted` arm (which
+        // fires right after this event and emits the `ModelCallCompleted`
+        // generation telemetry) reports the SAME cost/cache/reasoning numbers as
+        // the wallet accounting, instead of re-deriving a bare estimate.
+        self.resolved_calls
+            .lock()
+            .unwrap_or_else(|p| p.into_inner())
+            .insert(
+                iteration,
+                ResolvedCallFigures {
+                    cost_usd: call_cost,
+                    cache_creation_tokens,
+                    reasoning_tokens,
+                },
+            );
         let (input, output, cached, charged) = {
             let mut s = self.state.lock().unwrap();
             s.input_tokens += usage.input_tokens;
@@ -473,38 +513,12 @@ impl OpenhumanEventBridge {
         // The cost footer is a top-level surface; for a child run the global
         // cost tracker feed above is the authoritative accounting and the parent
         // emits its own footer, so suppress the per-child `TurnCostUpdated`.
+        // Per-call generation telemetry (`ModelCallCompleted`) is emitted from
+        // the `AgentEvent::ModelCompleted` arm instead — that event fires after
+        // `UsageRecorded` and is the only one carrying the captured request
+        // messages + completion, so the generation gets usage AND content in
+        // one shot (for parent and child scopes alike).
         if self.scope.is_none() {
-            // Per-call telemetry first (exact model/usage/cost for THIS call —
-            // trace exporters turn it into a Langfuse generation), then the
-            // cumulative footer rollup. Child-scoped calls carry no task
-            // attribution on this event, so they stay cumulative-only.
-            log::debug!(
-                "[tinyagents][usage] model_call_completed model={} iteration={} in={} out={} \
-                 cache_read={} cache_write={} reasoning={} cost_usd={:.6}",
-                self.model,
-                iteration,
-                usage.input_tokens,
-                usage.output_tokens,
-                usage.cache_read_tokens,
-                usage.cache_creation_tokens,
-                usage.reasoning_tokens,
-                call_cost,
-            );
-            self.send(AgentProgress::ModelCallCompleted {
-                model: self.model.clone(),
-                iteration,
-                input_tokens: usage.input_tokens,
-                output_tokens: usage.output_tokens,
-                cached_input_tokens: usage.cache_read_tokens,
-                // Use the carried-or-crate breakdown (computed above): for
-                // providers where cache-creation/reasoning tokens ride only on
-                // the carried UsageInfo, the crate `usage.*` fields are 0, which
-                // would leave per-call progress/Langfuse telemetry at zero even
-                // though the cost tracker got the right values (#4467).
-                cache_creation_tokens,
-                reasoning_tokens,
-                cost_usd: call_cost,
-            });
             self.send(AgentProgress::TurnCostUpdated {
                 model: self.model.clone(),
                 iteration,
@@ -515,6 +529,26 @@ impl OpenhumanEventBridge {
             });
         }
     }
+
+    /// Estimate one call's USD cost. Uses the tier-aware
+    /// [`agent::cost`](crate::openhuman::agent::cost) table (managed handles
+    /// like `chat-v1`/`burst-v1` + the vendor catalog + heuristics) — the
+    /// previous `cost::catalog::estimate_cost_usd` only knew concrete vendor
+    /// ids, so every managed-tier call priced as $0 in traces and the footer.
+    fn estimate_call_cost(model: &str, usage: &Usage) -> f64 {
+        crate::openhuman::agent::cost::estimate_call_cost_usd(
+            model,
+            &UsageInfo {
+                input_tokens: usage.input_tokens,
+                output_tokens: usage.output_tokens,
+                context_window: 0,
+                cached_input_tokens: usage.cache_read_tokens,
+                cache_creation_tokens: usage.cache_creation_tokens,
+                reasoning_tokens: usage.reasoning_tokens,
+                charged_amount_usd: 0.0,
+            },
+        )
+    }
 }
 
 impl EventListener for OpenhumanEventBridge {
@@ -611,6 +645,76 @@ impl EventListener for OpenhumanEventBridge {
             // exactly once per model call; prefer it over `ModelCompleted`'s
             // optional usage to avoid double counting.
             AgentEvent::UsageRecorded { usage } => self.record_usage(usage),
+            // Per-call generation telemetry. `ModelCompleted` fires exactly once
+            // per model call, after `UsageRecorded`, and is the only event
+            // carrying the captured request messages (incl. the system prompt)
+            // + completion (`RunPolicy.capture.model_io`, enabled in
+            // `run_policy_for`). Emitted for parent AND child scopes — the
+            // child call carries its owning `subagent_task_id` so the trace
+            // exporter nests the generation under the subagent span (this is
+            // what makes the Context Scout's model calls visible in Langfuse).
+            AgentEvent::ModelCompleted {
+                usage,
+                input,
+                output,
+                ..
+            } => {
+                let iteration = self.iteration();
+                let usage = usage.unwrap_or_default();
+                // Prefer the figures `record_usage` resolved for this call
+                // (charged>estimate cost + carried cache/reasoning breakdown —
+                // `UsageRecorded` fires before `ModelCompleted`), so the
+                // generation telemetry matches the wallet accounting exactly;
+                // fall back to a bare tier-aware estimate when absent.
+                let resolved = self
+                    .resolved_calls
+                    .lock()
+                    .unwrap_or_else(|p| p.into_inner())
+                    .remove(&iteration);
+                let call_cost = resolved
+                    .as_ref()
+                    .map(|r| r.cost_usd)
+                    .unwrap_or_else(|| Self::estimate_call_cost(&self.model, &usage));
+                let cache_creation_tokens = resolved
+                    .as_ref()
+                    .map(|r| r.cache_creation_tokens)
+                    .unwrap_or(usage.cache_creation_tokens);
+                let reasoning_tokens = resolved
+                    .as_ref()
+                    .map(|r| r.reasoning_tokens)
+                    .unwrap_or(usage.reasoning_tokens);
+                log::debug!(
+                    "[tinyagents][usage] model_call_completed model={} provider={} iteration={} \
+                     child={} in={} out={} cache_read={} cache_write={} reasoning={} \
+                     cost_usd={:.6} input_captured={} output_captured={}",
+                    self.model,
+                    self.provider_id,
+                    iteration,
+                    self.scope.is_some(),
+                    usage.input_tokens,
+                    usage.output_tokens,
+                    usage.cache_read_tokens,
+                    cache_creation_tokens,
+                    reasoning_tokens,
+                    call_cost,
+                    input.is_some(),
+                    output.is_some(),
+                );
+                self.send(AgentProgress::ModelCallCompleted {
+                    model: self.model.clone(),
+                    provider_id: self.provider_id.clone(),
+                    subagent_task_id: self.scope.as_ref().map(|s| s.task_id.clone()),
+                    input: input.clone(),
+                    output: output.clone(),
+                    iteration,
+                    input_tokens: usage.input_tokens,
+                    output_tokens: usage.output_tokens,
+                    cached_input_tokens: usage.cache_read_tokens,
+                    cache_creation_tokens,
+                    reasoning_tokens,
+                    cost_usd: call_cost,
+                });
+            }
             AgentEvent::CostRecorded { cost } => {
                 tracing::debug!(
                     cost = ?cost,
@@ -737,6 +841,8 @@ impl EventListener for OpenhumanEventBridge {
                             tool_name: requested_name.clone(),
                             success: false,
                             output_chars: 0,
+                            output: String::new(),
+                            arguments: Some(arguments.clone()),
                             elapsed_ms: 0,
                             iteration,
                             failure,
@@ -761,6 +867,7 @@ impl EventListener for OpenhumanEventBridge {
                             success: false,
                             output_chars: 0,
                             output: String::new(),
+                            arguments: Some(arguments.clone()),
                             elapsed_ms: 0,
                             iteration,
                             failure,
@@ -777,6 +884,12 @@ impl EventListener for OpenhumanEventBridge {
                 // instead of a rewritten ToolStarted. So this arm fires only for
                 // real, model-visible tools and needs no sentinel guard.
                 let iteration = self.iteration();
+                // Stamp the start instant so the completion event carries a real
+                // elapsed_ms (the crate's ToolCompleted has no timing payload).
+                self.tool_started_at
+                    .lock()
+                    .unwrap_or_else(|p| p.into_inner())
+                    .insert(call_id.as_str().to_string(), std::time::Instant::now());
                 match &self.scope {
                     None => self.send(AgentProgress::ToolCallStarted {
                         call_id: call_id.as_str().to_string(),
@@ -799,7 +912,10 @@ impl EventListener for OpenhumanEventBridge {
                 }
             }
             AgentEvent::ToolCompleted {
-                call_id, tool_name, ..
+                call_id,
+                tool_name,
+                input,
+                output,
             } => {
                 let iteration = self.iteration();
                 // The crate event carries no success/error, so read what the
@@ -813,10 +929,34 @@ impl EventListener for OpenhumanEventBridge {
                     .and_then(|mut m| m.remove(call_id.as_str()));
                 let success = outcome.as_ref().map(|(ok, ..)| *ok).unwrap_or(true);
                 // Real execution duration + output size the capture middleware
-                // recorded off the `ToolResult` (#4467, item 4). Absent (event
-                // projected before the middleware ran) → 0, as before.
-                let elapsed_ms = outcome.as_ref().map(|(_, _, e, _)| *e).unwrap_or(0);
-                let output_chars = outcome.as_ref().map(|(_, _, _, c)| *c).unwrap_or(0);
+                // recorded off the `ToolResult` (#4467, item 4). Fall back to
+                // the bridge's own ToolStarted stamp for duration, and to the
+                // captured payload for size, when the middleware ran late.
+                let stamped_elapsed = self
+                    .tool_started_at
+                    .lock()
+                    .unwrap_or_else(|p| p.into_inner())
+                    .remove(call_id.as_str())
+                    .map(|t| t.elapsed().as_millis() as u64)
+                    .unwrap_or(0);
+                let elapsed_ms = outcome
+                    .as_ref()
+                    .map(|(_, _, e, _)| *e)
+                    .filter(|e| *e > 0)
+                    .unwrap_or(stamped_elapsed);
+                // Tool result text, captured by the harness when
+                // `RunPolicy.capture.tool_io` is on (the loop emits it as a
+                // JSON string). Empty when capture is off.
+                let output_text = match output {
+                    Some(serde_json::Value::String(s)) => s.clone(),
+                    Some(v) => v.to_string(),
+                    None => String::new(),
+                };
+                let output_chars = outcome
+                    .as_ref()
+                    .map(|(_, _, _, c)| *c)
+                    .filter(|c| *c > 0)
+                    .unwrap_or_else(|| output_text.chars().count());
                 // Carry the classified failure onto whichever completion event
                 // this projects — main-agent OR sub-agent (#4459). Previously
                 // the sub-agent branch dropped it on the floor.
@@ -827,6 +967,8 @@ impl EventListener for OpenhumanEventBridge {
                         tool_name: tool_name.clone(),
                         success,
                         output_chars,
+                        output: output_text,
+                        arguments: input.clone(),
                         elapsed_ms,
                         iteration,
                         failure,
@@ -838,7 +980,8 @@ impl EventListener for OpenhumanEventBridge {
                         tool_name: tool_name.clone(),
                         success,
                         output_chars,
-                        output: String::new(),
+                        output: output_text,
+                        arguments: input.clone(),
                         elapsed_ms,
                         iteration,
                         failure,
@@ -980,6 +1123,151 @@ mod tests {
         assert_eq!((input, output), (100, 40));
     }
 
+    #[tokio::test]
+    async fn model_completed_projects_generation_with_content_and_provider() {
+        let (tx, mut rx) = tokio::sync::mpsc::channel(64);
+        let bridge = OpenhumanEventBridge::with_scope(
+            Some(tx),
+            "chat-v1",
+            "managed",
+            10,
+            None,
+            Arc::default(),
+            Arc::default(),
+            Arc::default(),
+            Arc::default(),
+        );
+        let sink = EventSink::new();
+        sink.subscribe(bridge.clone());
+
+        sink.emit(AgentEvent::ModelStarted {
+            call_id: "m1".into(),
+            model: "chat-v1".to_string(),
+        });
+        sink.emit(AgentEvent::ModelCompleted {
+            call_id: "m1".into(),
+            usage: Some(Usage::new(1_000, 50)),
+            input: Some(serde_json::json!([
+                {"role": "system", "content": "You are OpenHuman."}
+            ])),
+            output: Some(serde_json::json!({"role": "assistant", "content": "hi"})),
+        });
+
+        let mut seen = None;
+        while let Ok(p) = rx.try_recv() {
+            if let AgentProgress::ModelCallCompleted {
+                model,
+                provider_id,
+                subagent_task_id,
+                input,
+                output,
+                input_tokens,
+                cost_usd,
+                ..
+            } = p
+            {
+                seen = Some((
+                    model,
+                    provider_id,
+                    subagent_task_id,
+                    input,
+                    output,
+                    input_tokens,
+                    cost_usd,
+                ));
+            }
+        }
+        let (model, provider_id, task, input, output, input_tokens, cost_usd) =
+            seen.expect("ModelCallCompleted projected from ModelCompleted");
+        assert_eq!(model, "chat-v1");
+        assert_eq!(provider_id, "managed");
+        assert!(task.is_none(), "parent scope carries no task id");
+        assert!(input.unwrap().to_string().contains("You are OpenHuman."));
+        assert!(output.unwrap().to_string().contains("hi"));
+        assert_eq!(input_tokens, 1_000);
+        // chat-v1 is a managed tier handle — the tier-aware estimator must
+        // price it (> $0); the old catalog-only lookup returned exactly 0.
+        assert!(cost_usd > 0.0, "managed tier call must not price as $0");
+    }
+
+    #[tokio::test]
+    async fn subagent_model_completed_carries_task_attribution() {
+        let (tx, mut rx) = tokio::sync::mpsc::channel(64);
+        let bridge = OpenhumanEventBridge::with_scope(
+            Some(tx),
+            "burst-v1",
+            "managed",
+            8,
+            Some(SubagentScope {
+                agent_id: "context_scout".to_string(),
+                task_id: "ctx-1".to_string(),
+                extended_policy: true,
+            }),
+            Arc::default(),
+            Arc::default(),
+            Arc::default(),
+            Arc::default(),
+        );
+        let sink = EventSink::new();
+        sink.subscribe(bridge.clone());
+        sink.emit(AgentEvent::ModelCompleted {
+            call_id: "m1".into(),
+            usage: Some(Usage::new(10, 5)),
+            input: None,
+            output: None,
+        });
+        let mut task = None;
+        while let Ok(p) = rx.try_recv() {
+            if let AgentProgress::ModelCallCompleted {
+                subagent_task_id, ..
+            } = p
+            {
+                task = subagent_task_id;
+            }
+        }
+        assert_eq!(
+            task.as_deref(),
+            Some("ctx-1"),
+            "child model calls must carry the owning subagent task id"
+        );
+    }
+
+    #[tokio::test]
+    async fn tool_completed_projects_output_arguments_and_elapsed() {
+        let (tx, mut rx) = tokio::sync::mpsc::channel(64);
+        let bridge = OpenhumanEventBridge::new(Some(tx), "mock-model", 10);
+        let sink = EventSink::new();
+        sink.subscribe(bridge.clone());
+
+        sink.emit(AgentEvent::ToolStarted {
+            call_id: "t1".into(),
+            tool_name: "echo".to_string(),
+        });
+        sink.emit(AgentEvent::ToolCompleted {
+            call_id: "t1".into(),
+            tool_name: "echo".to_string(),
+            input: Some(serde_json::json!({"text": "ping"})),
+            output: Some(serde_json::Value::String("pong".to_string())),
+        });
+
+        let mut seen = None;
+        while let Ok(p) = rx.try_recv() {
+            if let AgentProgress::ToolCallCompleted {
+                output,
+                output_chars,
+                arguments,
+                ..
+            } = p
+            {
+                seen = Some((output, output_chars, arguments));
+            }
+        }
+        let (output, output_chars, arguments) = seen.expect("tool completion projected");
+        assert_eq!(output, "pong");
+        assert_eq!(output_chars, 4);
+        assert!(arguments.unwrap().to_string().contains("ping"));
+    }
+
     #[tokio::test]
     async fn unknown_tool_call_projects_attempted_name_as_failed_timeline_row() {
         // #4118: the crate recovers an unavailable-tool call via ReturnToolError
diff --git a/tests/memory_core_threads_raw_coverage_e2e.rs b/tests/memory_core_threads_raw_coverage_e2e.rs
index 7f9bc83f90..4622795415 100644
--- a/tests/memory_core_threads_raw_coverage_e2e.rs
+++ b/tests/memory_core_threads_raw_coverage_e2e.rs
@@ -559,6 +559,7 @@ async fn thread_ops_welcome_migration_and_turn_state_cover_error_and_cleanup_pat
         mode: "typed".into(),
         dedicated_thread: true,
         prompt_chars: 42,
+        prompt: String::new(),
         worker_thread_id: None,
         display_name: Some("Researcher".into()),
     }));
@@ -568,6 +569,7 @@ async fn thread_ops_welcome_migration_and_turn_state_cover_error_and_cleanup_pat
         elapsed_ms: 50,
         iterations: 2,
         output_chars: 100,
+        output: String::new(),
         worktree_path: None,
         changed_files: vec![],
         dirty_status: None,
diff --git a/tests/memory_raw_coverage_e2e.rs b/tests/memory_raw_coverage_e2e.rs
index 95e9fa0317..bfbda1bc1a 100644
--- a/tests/memory_raw_coverage_e2e.rs
+++ b/tests/memory_raw_coverage_e2e.rs
@@ -588,6 +588,7 @@ fn threads_turn_state_store_skips_corrupt_entries_and_marks_interrupted() {
         name: "memory.search".into(),
         round: 1,
         status: ToolTimelineStatus::Running,
+        failure: None,
         args_buffer: Some("{\"query\":\"coverage\"}".into()),
         display_name: Some("Search Memory".into()),
         detail: None,
@@ -613,6 +614,7 @@ fn threads_turn_state_store_skips_corrupt_entries_and_marks_interrupted() {
                 output_chars: Some(64),
                 display_name: None,
                 detail: None,
+                failure: None,
             }],
             transcript: vec![],
         }),
diff --git a/tests/memory_threads_raw_coverage_e2e.rs b/tests/memory_threads_raw_coverage_e2e.rs
index 239739febb..1fccf4c14b 100644
--- a/tests/memory_threads_raw_coverage_e2e.rs
+++ b/tests/memory_threads_raw_coverage_e2e.rs
@@ -1150,6 +1150,7 @@ fn thread_title_error_and_turn_state_helpers_cover_wire_shapes() {
         name: "memory.search".into(),
         round: 1,
         status: ToolTimelineStatus::Success,
+        failure: None,
         args_buffer: Some("{\"q\":\"coverage\"}".into()),
         display_name: Some("Memory Search".into()),
         detail: Some("2 results".into()),
@@ -3157,6 +3158,8 @@ fn turn_state_mirror_persists_progress_edges_from_public_events() {
         tool_name: "memory.search".into(),
         success: false,
         output_chars: 0,
+        output: String::new(),
+        arguments: None,
         elapsed_ms: 11,
         iteration: 2,
         failure: None,
@@ -3176,6 +3179,7 @@ fn turn_state_mirror_persists_progress_edges_from_public_events() {
         mode: "typed".into(),
         dedicated_thread: true,
         prompt_chars: 99,
+        prompt: String::new(),
         worker_thread_id: None,
         display_name: Some("Researcher".into()),
     }));
@@ -3209,8 +3213,10 @@ fn turn_state_mirror_persists_progress_edges_from_public_events() {
         success: true,
         output_chars: 44,
         output: "child tool output".into(),
+        arguments: None,
         elapsed_ms: 22,
         iteration: 1,
+        failure: None,
     }));
     assert!(mirror.observe(&AgentProgress::SubagentFailed {
         agent_id: "researcher".into(),
@@ -3451,6 +3457,7 @@ fn turn_state_store_persists_lists_marks_and_clears_snapshots() {
         name: "subagent:research".into(),
         round: 2,
         status: ToolTimelineStatus::Running,
+        failure: None,
         args_buffer: None,
         display_name: Some("Research".into()),
         detail: None,
@@ -3476,6 +3483,7 @@ fn turn_state_store_persists_lists_marks_and_clears_snapshots() {
                 output_chars: Some(10),
                 display_name: None,
                 detail: None,
+                failure: None,
             }],
             transcript: vec![],
         }),
diff --git a/vendor/tinyagents b/vendor/tinyagents
index 9442bd2964..357bcc8587 160000
--- a/vendor/tinyagents
+++ b/vendor/tinyagents
@@ -1 +1 @@
-Subproject commit 9442bd2964479b849ca78286eeb2a4e93a4547b4
+Subproject commit 357bcc85871b40c03a7dd81b61d1b3253bfb33e6