diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 628de29..4da73c5 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -1,10 +1,10 @@
 # Publish: build + npm release executor. Triggered by a vX.Y.Z tag, or
 # dispatched by release.yml after it tags a version.
 #
-# Matrix-builds postagent-core for the four supported targets (darwin
-# arm64/x64, linux x64/arm64-gnu), drops each binary into its platform
-# package, builds the postagent JS bundle, and publishes all five packages
-# to npm. Does not touch version numbers — that is release.yml's job.
+# Matrix-builds postagent-core for all supported targets (darwin
+# arm64/x64, linux x64/arm64-gnu, windows x64), drops each binary into its
+# platform package, builds the postagent JS bundle, and publishes all
+# packages to npm. Does not touch version numbers — that is release.yml's job.
 
 name: Publish
 
@@ -39,6 +39,10 @@ jobs:
             runner: ubuntu-latest
             package: postagent-linux-arm64-gnu
             binary: postagent-core
+          - target: x86_64-pc-windows-msvc
+            runner: windows-latest
+            package: postagent-win32-x64
+            binary: postagent-core.exe
 
     runs-on: ${{ matrix.runner }}
 
@@ -92,6 +96,7 @@ jobs:
           for pkg in postagent-darwin-arm64 postagent-darwin-x64 postagent-linux-x64-gnu postagent-linux-arm64-gnu; do
             cp artifacts/$pkg/* packages/$pkg/bin/
           done
+          cp artifacts/postagent-win32-x64/* packages/postagent-win32-x64/bin/
           chmod +x packages/postagent-darwin-*/bin/postagent-core
           chmod +x packages/postagent-linux-*/bin/postagent-core
 
@@ -103,7 +108,7 @@ jobs:
 
       - name: Publish platform packages
         run: |
-          for pkg in postagent-darwin-arm64 postagent-darwin-x64 postagent-linux-x64-gnu postagent-linux-arm64-gnu; do
+          for pkg in postagent-darwin-arm64 postagent-darwin-x64 postagent-linux-x64-gnu postagent-linux-arm64-gnu postagent-win32-x64; do
             pnpm --filter $pkg publish --no-git-checks --access public
           done
         env:
diff --git a/README.md b/README.md
index f5d5905..c52585e 100644
--- a/README.md
+++ b/README.md
@@ -10,10 +10,31 @@ No more installing a new MCP server or CLI for each app your agent uses. Postage
 
 ## Install
 
+Supports macOS (ARM64/x64), Linux (x64/ARM64), and Windows (x64).
+
 ```bash
 npm install -g postagent
 ```
 
+### Build from source (Windows)
+
+On Windows, if the prebuilt binary is unavailable, you can compile from source:
+
+```bash
+# 1. Install Rust: https://rustup.rs
+# 2. Clone and build the native binary
+git clone https://github.com/actionbook/postagent.git
+cd postagent
+cargo build --release --manifest-path packages/postagent-core/Cargo.toml
+
+# 3. Place the binary where the CLI expects it
+mkdir -p packages/postagent-win32-x64/bin
+copy packages\postagent-core\target\release\postagent-core.exe packages\postagent-win32-x64\bin\
+
+# 4. Link for development
+npm install -g .
+```
+
 ## Quickstart
 
 Postagent is meant to be driven by an agent, not by you. After installing, just tell your agent it has `postagent` available, then send it a task — for example:
diff --git a/packages/postagent-win32-x64/CHANGELOG.md b/packages/postagent-win32-x64/CHANGELOG.md
new file mode 100644
index 0000000..bb3d528
--- /dev/null
+++ b/packages/postagent-win32-x64/CHANGELOG.md
@@ -0,0 +1,7 @@
+# postagent-win32-x64
+
+## 0.3.2
+
+### Patch Changes
+
+- Initial Windows x64 native binary support.
diff --git a/packages/postagent-win32-x64/bin/.gitkeep b/packages/postagent-win32-x64/bin/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/packages/postagent-win32-x64/package.json b/packages/postagent-win32-x64/package.json
new file mode 100644
index 0000000..720d6ab
--- /dev/null
+++ b/packages/postagent-win32-x64/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "postagent-win32-x64",
+  "version": "0.3.2",
+  "description": "Postagent CLI native binary for Windows x64",
+  "os": [
+    "win32"
+  ],
+  "cpu": [
+    "x64"
+  ],
+  "bin": {
+    "postagent-core": "bin/postagent-core.exe"
+  },
+  "files": [
+    "bin/postagent-core.exe"
+  ],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/actionbook/postagent.git",
+    "directory": "packages/postagent-win32-x64"
+  }
+}
diff --git a/packages/postagent/package.json b/packages/postagent/package.json
index a332bef..3559052 100644
--- a/packages/postagent/package.json
+++ b/packages/postagent/package.json
@@ -33,6 +33,7 @@
     "postagent-darwin-arm64": "workspace:*",
     "postagent-darwin-x64": "workspace:*",
     "postagent-linux-x64-gnu": "workspace:*",
-    "postagent-linux-arm64-gnu": "workspace:*"
+    "postagent-linux-arm64-gnu": "workspace:*",
+    "postagent-win32-x64": "workspace:*"
   }
 }
diff --git a/packages/postagent/scripts/postinstall.cjs b/packages/postagent/scripts/postinstall.cjs
index cf992e6..9baf00d 100644
--- a/packages/postagent/scripts/postinstall.cjs
+++ b/packages/postagent/scripts/postinstall.cjs
@@ -10,6 +10,7 @@ const PLATFORM_PACKAGES = {
   "darwin-x64": "postagent-darwin-x64",
   "linux-x64": "postagent-linux-x64-gnu",
   "linux-arm64": "postagent-linux-arm64-gnu",
+  "win32-x64": "postagent-win32-x64",
 };
 
 function resolvePackageDir(packageName) {
@@ -34,9 +35,14 @@ function main() {
   const packageDir = resolvePackageDir(packageName);
   if (!packageDir) return;
 
-  const binaryPath = path.join(packageDir, "bin", "postagent-core");
+  const binaryName = process.platform === "win32" ? "postagent-core.exe" : "postagent-core";
+  const binaryPath = path.join(packageDir, "bin", binaryName);
   if (fs.existsSync(binaryPath)) {
-    fs.chmodSync(binaryPath, 0o755);
+    try {
+      fs.chmodSync(binaryPath, 0o755);
+    } catch {
+      // chmod is a no-op on Windows; ignore the error
+    }
   }
 }
 
diff --git a/packages/postagent/src/bin-resolve.ts b/packages/postagent/src/bin-resolve.ts
index 658c535..08ce364 100644
--- a/packages/postagent/src/bin-resolve.ts
+++ b/packages/postagent/src/bin-resolve.ts
@@ -8,6 +8,7 @@ const PLATFORM_PACKAGES: Record<string, string> = {
   "darwin-x64": "postagent-darwin-x64",
   "linux-x64": "postagent-linux-x64-gnu",
   "linux-arm64": "postagent-linux-arm64-gnu",
+  "win32-x64": "postagent-win32-x64",
 };
 
 const require = createRequire(import.meta.url);
@@ -48,7 +49,7 @@ export function resolveBinary(): string {
     process.exit(1);
   }
 
-  const binaryName = "postagent-core";
+  const binaryName = process.platform === "win32" ? "postagent-core.exe" : "postagent-core";
   const packageDir = resolvePackageDir(packageName);
 
   if (!packageDir) {