Add Antigravity CLI provider

README.md

@@ -26,6 +26,7 @@ OpenUsage lives in your menu bar and shows you how much of your AI coding subscr
 
 - [**Amp**](docs/providers/amp.md) / free tier, bonus, credits
 - [**Antigravity**](docs/providers/antigravity.md) / all models
+- [**Antigravity CLI**](docs/providers/antigravity-cli.md) / gemini pro, gemini flash, claude
 - [**Claude**](docs/providers/claude.md) / session, weekly, extra usage, local token usage (ccusage)
 - [**Codex**](docs/providers/codex.md) / session, weekly, reviews, credits
 - [**Copilot**](docs/providers/copilot.md) / premium, chat, completions

docs/plugins/api.md

@@ -230,7 +230,7 @@ const resp = ctx.host.http.request({
 ## Keychain (macOS only)
 
 ```typescript
-host.keychain.readGenericPassword(service: string): string
+host.keychain.readGenericPassword(service: string, account?: string): string
 ```
 
 Reads a generic password from the macOS Keychain.
@@ -239,6 +239,7 @@ Reads a generic password from the macOS Keychain.
 
 - **macOS only**: Throws on other platforms
 - **Throws if not found**: Returns the password string if found, throws otherwise
+- **Optional account**: When `account` is provided, lookup is scoped to both service and account
 
 ### Example
 

docs/providers/antigravity-cli.md

@@ -0,0 +1,36 @@
+# Antigravity CLI
+
+Tracks Google Antigravity CLI (`agy`) Cloud Code quota.
+
+## Setup
+
+Sign in with the CLI first:
+
+```bash
+agy
+```
+
+OpenUsage uses the CLI keychain login. It does not start a browser OAuth flow.
+
+## Data Sources
+
+- Non-secret CLI context: `~/.gemini/antigravity-cli/`
+- Auth: the Antigravity CLI OS keyring login. On macOS, current CLI builds store this under keychain service `gemini`, account `antigravity`.
+- Quota APIs:
+  - `POST https://daily-cloudcode-pa.googleapis.com/v1internal:loadCodeAssist`
+  - `POST https://daily-cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels`
+  - `POST https://daily-cloudcode-pa.googleapis.com/v1internal:retrieveUserQuota`
+
+The provider does not read legacy Gemini OAuth files such as `~/.gemini/oauth_creds.json`.
+
+## Quota Lines
+
+- Gemini model IDs or labels containing `gemini` and `pro` -> `Gemini Pro`
+- Gemini model IDs or labels containing `gemini` and `flash` -> `Gemini Flash`
+- Other non-Gemini model pools -> `Claude`
+
+When multiple buckets map to the same line, OpenUsage shows the lowest remaining fraction.
+
+## Notes
+
+Official Antigravity docs describe a shared agent harness and shared settings between the CLI and Antigravity 2.0. OpenUsage tracks Antigravity CLI separately because the CLI uses different state and auth paths.

plugins/antigravity-cli/README.md

@@ -0,0 +1,15 @@
+# Antigravity CLI
+
+This provider reads Google Antigravity CLI (`agy`) usage from the Cloud Code quota APIs used by the CLI. It is separate from the Antigravity IDE and Gemini providers because `agy` stores state and auth differently.
+
+Authenticate with `agy` before enabling this provider:
+
+```sh
+agy
+```
+
+OpenUsage reads non-secret context only from `~/.gemini/antigravity-cli/`. It does not read legacy Gemini OAuth files such as `~/.gemini/oauth_creds.json`.
+
+Authentication comes from the Antigravity CLI OS keyring login. On macOS, current CLI builds store it under keychain service `gemini` and account `antigravity`. The provider accepts raw tokens, JSON OAuth-style payloads, and `go-keyring-base64:` wrapped values when the keychain returns them.
+
+Official Antigravity docs describe a shared agent harness and shared settings between the CLI and Antigravity 2.0. OpenUsage tracks Antigravity CLI separately so the auth path and implementation remain clear.