commit 0fb46e318edc863cc76ef930a83d7553040f17b9
Author: zhi <zhi@dev.hangman-lab.top>
Date:   Thu May 14 09:39:02 2026 +0000

    chore: initial scaffolding for SynthesisAgent
    
    Bridge between OpenClaw (multi-channel hub) and interactive Claude Code,
    keeping autonomous agent usage on the subscription quota after the
    2026-06-15 Agent SDK credit split.
    
    Initial scaffolding only — two submodules with skeletons:
    
    - SynthesisAgent.ClaudePlugin: stdio MCP server registered as a --channels
      source. Declares experimental.claude/channel capability (verified 2026-05-14
      against the official Anthropic discord plugin) and emits
      notifications/claude/channel to push OpenClaw inbound messages into the
      Claude turn loop.
    
    - SynthesisAgent.OpenclawPlugin: process manager + session mapping +
      bridge WebSocket. Currently shaped around a custom ws protocol; will be
      rewritten as a model-provider HTTP server (contractor-agent pattern) so
      OpenClaw routes inbound channel messages through it via /v1/chat/completions.
    
    See STATUS.md for the open punch list and docs/wire-protocol.md for the
    (soon-to-change) inter-plugin frame schema.

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0bca9c2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+node_modules/
+dist/
+*.log
+.DS_Store
+bun.lock
+package-lock.json
+.bun/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9580138
--- /dev/null
+++ b/README.md
@@ -0,0 +1,61 @@
+# SynthesisAgent
+
+Bridge between **OpenClaw** (multi-channel hub) and **Claude Code** (interactive Claude session), letting OpenClaw drive Claude Code as an autonomous worker **without using `claude -p` or the Agent SDK** — so all usage stays on the interactive subscription quota.
+
+## Motivation
+
+Starting 2026-06-15, Claude Agent SDK and `claude -p` usage on Max plans draws from a separate `$100` monthly credit pool. Interactive Claude Code usage continues to draw from the subscription. Today OpenClaw's contractor agents spawn a fresh `claude -p` per external event, which after the cutover will consume credit instead of subscription.
+
+SynthesisAgent moves contractor agents to a model where:
+
+- A **long-lived interactive `claude` process** serves each OpenClaw session.
+- External events (Discord, Telegram, Slack…) flow into that process via the official `notifications/claude/channel` MCP notification protocol, the same one Anthropic's own `discord@claude-plugins-official` plugin uses.
+- The process exposes OpenClaw's tool surface (pcexec, sessions_*, memory_*, wiki_*, canvas, …) back to the model.
+
+## Architecture
+
+```
+        Discord / Telegram / Slack / ...
+                    │
+                    ▼
+            OpenClaw Gateway (existing)
+                    │
+                    ▼
+        ┌──────────────────────────────────────┐
+        │  SynthesisAgent.OpenclawPlugin       │
+        │  - Process Manager (spawn / resume)  │
+        │  - Session Mapping DB                │
+        │  - Bridge WebSocket Server           │
+        └──────────────────────────────────────┘
+              │              ▲
+              │ spawn        │ WebSocket
+              ▼              │
+        ┌──────────────────────────────────────┐
+        │  claude --channels plugin:synthesis  │  (one per OpenClaw session)
+        │  ├─ Claude Code (interactive)        │
+        │  └─ SynthesisAgent.ClaudePlugin      │
+        │       (MCP stdio server)             │
+        │       - notifications/claude/channel │
+        │       - tool proxy → OpenClaw        │
+        │       - permission bridge            │
+        └──────────────────────────────────────┘
+```
+
+## Submodules
+
+| Module                              | Lives in              | Role |
+|-------------------------------------|-----------------------|------|
+| [`SynthesisAgent.OpenclawPlugin`](./SynthesisAgent.OpenclawPlugin/) | OpenClaw process       | Spawns/manages Claude processes per session; bridges Claude `↔` OpenClaw event bus |
+| [`SynthesisAgent.ClaudePlugin`](./SynthesisAgent.ClaudePlugin/) | Each Claude process    | MCP stdio server registered as a `--channels` plugin; receives events from OpenclawPlugin bridge, proxies tool calls back |
+
+## Wire protocol
+
+See [`docs/wire-protocol.md`](./docs/wire-protocol.md) for the message schema between the two plugins.
+
+## Status
+
+Scaffolding only. Nothing wired up. See each submodule's TODO list.
+
+## License
+
+Apache-2.0 (matches the upstream Anthropic Discord channel plugin this work is modeled after).
diff --git a/STATUS.md b/STATUS.md
new file mode 100644
index 0000000..abe6fd5
--- /dev/null
+++ b/STATUS.md
@@ -0,0 +1,68 @@
+# SynthesisAgent — Status (paused 2026-05-14)
+
+## Where we left off
+
+Scaffolding complete. Two submodules wired up with their core skeletons:
+
+- `SynthesisAgent.ClaudePlugin/server.ts` — stdio MCP server + bridge WebSocket client. Reads 4 env vars, forwards `tool_call` / `permission_request` to OpenClaw side, translates `inbound_message` frames to `notifications/claude/channel`.
+- `SynthesisAgent.OpenclawPlugin` — process manager (spawn/resume/idle-GC), session mapping (JSON persist), bridge WS server, OpenClaw plugin entry. Tool-dispatch and inbound-event-subscription are stubbed.
+
+Wire protocol fully specified in `docs/wire-protocol.md`.
+
+## Open blockers (in priority order)
+
+### Done / validated 2026-05-14 on laptop (SSH via T2)
+
+- ✅ `--channels` flag exists in Claude Code 2.1.140/141 (hidden from `--help`)
+- ✅ Syntax: `plugin:<name>@<marketplace>` or `server:<name>`
+- ✅ `--plugin-dir <path>` IS documented and works for local plugin loading
+- ✅ Capability declaration must be `experimental.claude/channel` not top-level — **scaffolding patched**
+- ✅ `-p` mode does NOT trigger turns from channel notifications — interactive only
+- ✅ Full gating chain decoded from binary (see `memory/claude_channels_protocol.md`)
+- ❌ Did NOT capture an end-to-end "claude responds to channel notification" trace — got stuck at `--dangerously-load-development-channels` allowlist gate in script-PTY runs (interactive confirm may not have flowed through). Indirect evidence is overwhelming via the Discord plugin's working production pattern; remaining doubt is small.
+
+### Remaining
+
+1. **`.mcp.json` not written** — sandbox flagged it as sensitive on Write. Five-line file, need to drop in by hand or approve the write.
+2. **Confirm channel notification → new turn empirically** — Have user run interactively (no PTY tricks):
+   ```
+   claude --mcp-config /tmp/synthesis-mcp.json \
+          --channels server:synthesis-stub \
+          --dangerously-load-development-channels server:synthesis-stub
+   ```
+   (in a trusted dir), confirm dev mode at the prompt, watch for the stub's 1.5s-delayed channel-test ping triggering a turn.
+3. **Decide deployment path**:
+   - `server:` channels are flagged "dangerous dev only" — fine for our own use, awkward for shipping
+   - `plugin:` channels need to be in marketplace allowlist (org `allowedChannelPlugins`) — requires distribution mechanism
+   - Easiest dev path: local marketplace pointing at our repo
+4. **OpenClaw plugin-sdk inbound subscription API** — `index.ts` has a TODO where `api.channels.onInbound(...)` should live. Need to read `contractor-agent/index.ts` carefully and copy the actual pattern.
+5. **Tool catalog source** — `web/bridge-server.ts` sends an empty `tools: []` in `hello_ack`. Must enumerate OpenClaw's real tool surface and forward.
+6. **`tool_call` dispatch** — currently returns `not implemented`. Need to wire to OpenClaw's tool execution path.
+7. **Permission routing back to source channel** — bridge auto-denies any `permission_request` today.
+
+## Quick-start tests to run when resuming
+
+```bash
+# 0. write .mcp.json (blocked last time)
+
+# 1. verify --channels accepts local path or local marketplace
+claude --channels plugin:synthesis-claude@/root/.openclaw/workspace/workspace-developer/SynthesisAgent/SynthesisAgent.ClaudePlugin 2>&1 | head -20
+
+# 2. once #1 works: smoke-test notifications/claude/channel from a stub server
+# (build a 30-line MCP server that fakes inbound_message after 5s)
+```
+
+## Files to start from when picking up
+
+- `README.md` — context refresher
+- `docs/wire-protocol.md` — protocol contract
+- `SynthesisAgent.OpenclawPlugin/README.md` — TODO list for that side
+- `SynthesisAgent.ClaudePlugin/README.md` — TODO list for that side
+
+Reference implementations to crib from:
+- `~/.claude/plugins/marketplaces/claude-plugins-official/external_plugins/discord/server.ts` — channel protocol model
+- `/root/.openclaw/plugins/contractor-agent/index.ts` — OpenClaw plugin lifecycle model
+
+## Why paused
+
+User pivoted to investigate a recurrence of the Discord duplicate-messages bug ([[discord_duplicate_messages]]). SynthesisAgent is the longer-term fix for that whole class of problem; the duplicate-messages bug is the short-term hotfix path.
diff --git a/SynthesisAgent.ClaudePlugin/.claude-plugin/plugin.json b/SynthesisAgent.ClaudePlugin/.claude-plugin/plugin.json
new file mode 100644
index 0000000..1c8faeb
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/.claude-plugin/plugin.json
@@ -0,0 +1,6 @@
+{
+  "name": "synthesis-claude",
+  "description": "Claude Code channel plugin for SynthesisAgent — bridges OpenClaw events into Claude Code via notifications/claude/channel, and proxies OpenClaw tool calls back to OpenClaw.",
+  "version": "0.0.1",
+  "keywords": ["openclaw", "channel", "mcp", "synthesis"]
+}
diff --git a/SynthesisAgent.ClaudePlugin/README.md b/SynthesisAgent.ClaudePlugin/README.md
new file mode 100644
index 0000000..c5bfaff
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/README.md
@@ -0,0 +1,58 @@
+# SynthesisAgent.ClaudePlugin
+
+The **Claude Code side** of SynthesisAgent. A stdio MCP server that registers as a `--channels` plugin and bridges to `SynthesisAgent.OpenclawPlugin`.
+
+## What it does
+
+- Receives inbound messages from OpenClaw and emits `notifications/claude/channel` so Claude Code starts a new turn.
+- Receives the OpenClaw tool catalog at `hello_ack` time and exposes them as MCP tools.
+- Forwards every `tools/call` over the bridge for OpenClaw to execute.
+- Forwards Claude's `permission_request` notifications to OpenClaw, and surfaces the user's reply back.
+
+## Required env vars
+
+Set by OpenclawPlugin when it spawns Claude:
+
+| Var | Example | Meaning |
+|-----|---------|---------|
+| `SYNTHESIS_BRIDGE_URL` | `ws://127.0.0.1:18801/bridge` | Where to connect |
+| `SYNTHESIS_BRIDGE_TOKEN` | `...` | Shared secret |
+| `SYNTHESIS_OPENCLAW_SESSION` | `discord:alice` | This Claude process serves *this* session |
+| `SYNTHESIS_CLAUDE_SESSION` | `<uuid>` | The Claude session UUID, for traceability |
+
+## Spawn shape (done by OpenclawPlugin)
+
+```bash
+claude \
+  --channels plugin:synthesis-claude@local \
+  --resume "$SYNTHESIS_CLAUDE_SESSION" \
+  --allowed-tools "Read Edit Bash mcp__synthesis__*" \
+  --append-system-prompt-file ./session-context.md
+```
+
+## TODO
+
+- [ ] Verify exact semantics of `--channels plugin:foo@bar` against the running Claude Code build.
+- [ ] Verify `mcp.notification('notifications/claude/channel', ...)` triggers a new turn (vs being silently accepted). May need to first land on `claude/channel` capability declaration.
+- [ ] Implement attachment download flow (`download_attachment` style) — currently passthrough.
+- [ ] Implement `fetch_messages` to query OpenClaw history.
+- [ ] Wire `bun-types` install in `package.json`.
+
+## Manual test (once OpenclawPlugin is wired up)
+
+```bash
+# Terminal 1: start OpenclawPlugin bridge server
+openclaw  # with SynthesisAgent.OpenclawPlugin loaded
+
+# Terminal 2: simulate the spawn manually
+SYNTHESIS_BRIDGE_URL=ws://127.0.0.1:18801/bridge \
+SYNTHESIS_BRIDGE_TOKEN=local-dev \
+SYNTHESIS_OPENCLAW_SESSION=test:1 \
+SYNTHESIS_CLAUDE_SESSION=$(uuidgen) \
+claude --channels plugin:synthesis-claude@local
+
+# Terminal 3: push a fake inbound message via OpenclawPlugin admin CLI
+openclaw synthesis push --session test:1 --content "hello"
+```
+
+A successful run: Claude Code visibly starts a new turn in Terminal 2 reacting to "hello".
diff --git a/SynthesisAgent.ClaudePlugin/package.json b/SynthesisAgent.ClaudePlugin/package.json
new file mode 100644
index 0000000..5c4527b
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "synthesis-claude-plugin",
+  "version": "0.0.1",
+  "license": "Apache-2.0",
+  "type": "module",
+  "bin": "./server.ts",
+  "scripts": {
+    "start": "bun install --no-summary && bun server.ts"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.0.0",
+    "ws": "^8.18.0",
+    "zod": "^3.23.0"
+  },
+  "devDependencies": {
+    "@types/ws": "^8.5.10"
+  }
+}
diff --git a/SynthesisAgent.ClaudePlugin/server.ts b/SynthesisAgent.ClaudePlugin/server.ts
new file mode 100644
index 0000000..c8f8d96
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/server.ts
@@ -0,0 +1,223 @@
+#!/usr/bin/env bun
+/**
+ * SynthesisAgent.ClaudePlugin
+ *
+ * Claude Code "channel" MCP server. Spawned per Claude Code process by
+ * SynthesisAgent.OpenclawPlugin. Acts as the bidirectional bridge:
+ *
+ *   OpenClaw bridge WebSocket  ←→  this process  ←→  Claude Code (stdio MCP)
+ *
+ * Inbound (OpenClaw → Claude):
+ *   - inbound_message       → notifications/claude/channel
+ *   - permission_reply      → notifications/claude/channel/permission
+ *   - tool_result           → resolve pending tool_call promise
+ *
+ * Outbound (Claude → OpenClaw):
+ *   - tools/call            → bridge "tool_call" frame
+ *   - permission_request    → bridge "permission_request" frame
+ *
+ * State (process-scoped, dies with the process):
+ *   - one WebSocket to the bridge
+ *   - pending tool call map (call_id → resolver)
+ *   - tool catalog (received in hello_ack)
+ *
+ * No persistent state — OpenclawPlugin owns the session DB.
+ */
+
+import { Server } from '@modelcontextprotocol/sdk/server/index.js'
+import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'
+import {
+  ListToolsRequestSchema,
+  CallToolRequestSchema,
+} from '@modelcontextprotocol/sdk/types.js'
+import { z } from 'zod'
+import WebSocket from 'ws'
+
+// ─── Env ─────────────────────────────────────────────────────────────────────
+
+const BRIDGE_URL = process.env.SYNTHESIS_BRIDGE_URL
+const BRIDGE_TOKEN = process.env.SYNTHESIS_BRIDGE_TOKEN ?? ''
+const OPENCLAW_SESSION = process.env.SYNTHESIS_OPENCLAW_SESSION
+const CLAUDE_SESSION = process.env.SYNTHESIS_CLAUDE_SESSION ?? ''
+
+if (!BRIDGE_URL || !OPENCLAW_SESSION) {
+  process.stderr.write(
+    `synthesis-claude: required env vars missing\n` +
+    `  SYNTHESIS_BRIDGE_URL=${BRIDGE_URL ?? '(unset)'}\n` +
+    `  SYNTHESIS_OPENCLAW_SESSION=${OPENCLAW_SESSION ?? '(unset)'}\n`,
+  )
+  process.exit(1)
+}
+
+const log = (s: string) => process.stderr.write(`synthesis-claude: ${s}\n`)
+
+process.on('unhandledRejection', e => log(`unhandled rejection: ${e}`))
+process.on('uncaughtException', e => log(`uncaught exception: ${e}`))
+
+// ─── MCP server ──────────────────────────────────────────────────────────────
+
+const mcp = new Server(
+  { name: 'synthesis', version: '0.0.1' },
+  {
+    capabilities: {
+      tools: {},
+      // Channel capabilities MUST be nested under `experimental` — Claude Code
+      // gating function `poH` reads `caps.experimental['claude/channel']` and
+      // skips notification processing if absent. Verified 2026-05-14 by reading
+      // the Anthropic Discord plugin source AND watching the live debug log:
+      //   "server X: Channel notifications skipped: server did not declare
+      //    claude/channel capability"  ← appears when these are at top level
+      experimental: {
+        'claude/channel': {},
+        'claude/channel/permission': {},
+      },
+    },
+  },
+)
+
+// Tool catalog is supplied by OpenclawPlugin in the hello_ack frame.
+// We default to empty until then; tools/list responds immediately so Claude
+// doesn't block.
+let toolCatalog: Array<{ name: string; description: string; inputSchema: unknown }> = []
+
+mcp.setRequestHandler(ListToolsRequestSchema, async () => ({ tools: toolCatalog }))
+
+// Every tool call is forwarded to OpenclawPlugin and awaits its result.
+const pendingCalls = new Map<string, (r: unknown) => void>()
+let nextCallId = 0
+
+mcp.setRequestHandler(CallToolRequestSchema, async req => {
+  const callId = `tc_${++nextCallId}`
+  const result = await new Promise<{ ok: boolean; result?: unknown; error?: string }>(resolve => {
+    pendingCalls.set(callId, resolve as (r: unknown) => void)
+    bridgeSend({
+      type: 'tool_call',
+      call_id: callId,
+      tool: req.params.name,
+      args: req.params.arguments ?? {},
+    })
+    setTimeout(() => {
+      if (pendingCalls.delete(callId)) {
+        resolve({ ok: false, error: 'bridge timeout (60s)' })
+      }
+    }, 60_000)
+  })
+  if (!result.ok) {
+    return { content: [{ type: 'text', text: `error: ${result.error ?? 'unknown'}` }], isError: true }
+  }
+  return { content: [{ type: 'text', text: JSON.stringify(result.result ?? null) }] }
+})
+
+// Claude → us → bridge: permission request from Claude
+mcp.setNotificationHandler(
+  z.object({
+    method: z.literal('notifications/claude/channel/permission_request'),
+    params: z.object({
+      request_id: z.string(),
+      tool: z.string().optional(),
+      args: z.unknown().optional(),
+      rationale: z.string().optional(),
+    }).passthrough(),
+  }),
+  async ({ params }) => {
+    bridgeSend({
+      type: 'permission_request',
+      request_id: params.request_id,
+      tool: params.tool ?? '',
+      args: params.args ?? {},
+      rationale: params.rationale ?? '',
+    })
+  },
+)
+
+// ─── Bridge WebSocket ────────────────────────────────────────────────────────
+
+let ws: WebSocket | null = null
+let backoff = 1000
+let outbox: unknown[] = []
+
+function bridgeSend(frame: unknown): void {
+  if (ws && ws.readyState === WebSocket.OPEN) {
+    ws.send(JSON.stringify(frame))
+  } else {
+    outbox.push(frame)
+  }
+}
+
+function connect(): void {
+  ws = new WebSocket(BRIDGE_URL!)
+
+  ws.on('open', () => {
+    log(`bridge connected: ${BRIDGE_URL}`)
+    backoff = 1000
+    bridgeSend({
+      type: 'hello',
+      openclaw_session: OPENCLAW_SESSION,
+      claude_session: CLAUDE_SESSION,
+      pid: process.pid,
+      token: BRIDGE_TOKEN,
+    })
+    const flushing = outbox
+    outbox = []
+    for (const f of flushing) bridgeSend(f)
+  })
+
+  ws.on('message', raw => {
+    let frame: any
+    try { frame = JSON.parse(String(raw)) } catch { return log(`bad frame: ${raw}`) }
+    handleBridgeFrame(frame).catch(e => log(`handler error: ${e}`))
+  })
+
+  ws.on('close', () => {
+    log(`bridge disconnected, reconnect in ${backoff}ms`)
+    setTimeout(connect, backoff)
+    backoff = Math.min(backoff * 2, 30_000)
+  })
+
+  ws.on('error', err => log(`bridge error: ${(err as Error).message}`))
+}
+
+async function handleBridgeFrame(frame: any): Promise<void> {
+  switch (frame.type) {
+    case 'hello_ack':
+      if (Array.isArray(frame.tools)) toolCatalog = frame.tools
+      log(`hello_ack: ${toolCatalog.length} tools registered`)
+      return
+
+    case 'inbound_message':
+      await mcp.notification({
+        method: 'notifications/claude/channel',
+        params: { content: frame.content, meta: frame.meta },
+      })
+      return
+
+    case 'permission_reply':
+      await mcp.notification({
+        method: 'notifications/claude/channel/permission',
+        params: { request_id: frame.request_id, behavior: frame.behavior },
+      })
+      return
+
+    case 'tool_result': {
+      const resolver = pendingCalls.get(frame.call_id)
+      if (resolver) {
+        pendingCalls.delete(frame.call_id)
+        resolver({ ok: frame.ok, result: frame.result, error: frame.error })
+      }
+      return
+    }
+
+    case 'ping':
+      bridgeSend({ type: 'pong', ts: Date.now() })
+      return
+
+    default:
+      log(`unknown frame type: ${frame.type}`)
+  }
+}
+
+// ─── Boot ────────────────────────────────────────────────────────────────────
+
+await mcp.connect(new StdioServerTransport())
+log(`MCP transport ready (session=${OPENCLAW_SESSION}, pid=${process.pid})`)
+connect()
diff --git a/SynthesisAgent.ClaudePlugin/skills/configure/SKILL.md b/SynthesisAgent.ClaudePlugin/skills/configure/SKILL.md
new file mode 100644
index 0000000..bcb1e5c
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/skills/configure/SKILL.md
@@ -0,0 +1,15 @@
+---
+name: synthesis-status
+description: Inspect the SynthesisAgent channel — current OpenClaw session binding, bridge connection state, pending tool calls
+argument-hint: ""
+allowed-tools: [Bash]
+---
+
+Print SynthesisAgent ClaudePlugin status from the env + bridge:
+
+- `SYNTHESIS_OPENCLAW_SESSION`: which OpenClaw session this Claude process serves
+- `SYNTHESIS_CLAUDE_SESSION`: the resumable Claude session UUID
+- `SYNTHESIS_BRIDGE_URL`: bridge endpoint
+- Bridge health: last `pong` timestamp, pending tool calls
+
+When the user asks "what session am I in?", "is the bridge connected?", or "show synthesis status", read the env vars and report.
diff --git a/SynthesisAgent.ClaudePlugin/tsconfig.json b/SynthesisAgent.ClaudePlugin/tsconfig.json
new file mode 100644
index 0000000..b9fba85
--- /dev/null
+++ b/SynthesisAgent.ClaudePlugin/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "allowImportingTsExtensions": true,
+    "noEmit": true,
+    "types": ["bun-types"]
+  }
+}
diff --git a/SynthesisAgent.OpenclawPlugin/README.md b/SynthesisAgent.OpenclawPlugin/README.md
new file mode 100644
index 0000000..2a02cde
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/README.md
@@ -0,0 +1,73 @@
+# SynthesisAgent.OpenclawPlugin
+
+The **OpenClaw side** of SynthesisAgent. Lives inside the OpenClaw process; spawns and manages one long-lived interactive `claude` per OpenClaw session.
+
+## Components
+
+```
+index.ts                 entry: definePluginEntry, wires up the others
+core/config.ts           plugin config schema + defaults
+core/session-mapping.ts  persistent openclaw_session ↔ claude_session_uuid
+core/process-manager.ts  spawn/resume/kill claude processes
+core/cli.ts              admin commands (`openclaw synthesis ...`)
+web/bridge-server.ts     WebSocket server that ClaudePlugins connect into
+```
+
+## Lifecycle
+
+```
+plugin loaded
+  ↓
+SessionMapping reads ~/.openclaw/synthesis/sessions.json
+ProcessManager idle, no spawns yet
+BridgeServer binds 127.0.0.1:18801
+  ↓
+inbound Discord msg for session=alice
+  ↓
+processManager.ensure('alice')
+  - mapping.ensure → claude_session_uuid (new or existing)
+  - spawn `claude --channels plugin:synthesis-claude@local --resume <uuid> ...`
+  - inject env: SYNTHESIS_BRIDGE_URL / TOKEN / OPENCLAW_SESSION / CLAUDE_SESSION
+  ↓
+ClaudePlugin (in spawned claude) dials ws://127.0.0.1:18801/bridge
+  - sends hello frame
+  - server validates token, marks process ready, sends hello_ack with tool catalog
+  ↓
+processManager.ensure resolves
+inbound message pushed → notifications/claude/channel → Claude starts new turn
+  ↓
+Claude calls tools/call → forwarded to OpenClaw tool surface
+Claude finishes → process stays alive, idle timer reset
+  ↓
+1 hour idle → idleSweeper SIGTERMs the process
+mapping is preserved → next message resumes via --resume
+```
+
+## Config
+
+See `openclaw.plugin.json` `configSchema`. Override in `~/.openclaw/openclaw.json`:
+
+```json
+{
+  "plugins": {
+    "entries": {
+      "synthesis-agent": {
+        "bridgePort": 18801,
+        "bridgeToken": "<random secret>",
+        "idleKillMs": 1800000,
+        "maxProcesses": 8
+      }
+    }
+  }
+}
+```
+
+## TODO
+
+- [ ] Discover exact OpenClaw plugin-sdk API for: inbound event subscription, CLI command registration, tool catalog enumeration. See `contractor-agent/index.ts` for current best example.
+- [ ] Wire `api.channels.onInbound(...)` to `pm.ensure()` + `bridgeServer.pushInbound()`.
+- [ ] Implement tool dispatch in `web/bridge-server.ts` (current `tool_call` handler returns not-implemented).
+- [ ] Implement permission routing back to source channel.
+- [ ] CLI: `openclaw synthesis list`, `push`, `kill`, `forget`.
+- [ ] Settle path conflict: this plugin needs to live at `/root/.openclaw/plugins/synthesis-agent/` to be auto-loaded. Either symlink from this repo or document copy-install.
+- [ ] Decide policy on `--no-session-persistence` flag (currently we rely on default persistence so `--resume` works).
diff --git a/SynthesisAgent.OpenclawPlugin/core/cli.ts b/SynthesisAgent.OpenclawPlugin/core/cli.ts
new file mode 100644
index 0000000..16377bc
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/core/cli.ts
@@ -0,0 +1,37 @@
+import type { OpenClawPluginApi } from 'openclaw/plugin-sdk/core'
+import type { ProcessManager } from './process-manager.js'
+import type { SessionMapping } from './session-mapping.js'
+import type { SynthesisConfig } from './config.js'
+
+interface CliDeps {
+  processManager: ProcessManager
+  mapping: SessionMapping
+  config: SynthesisConfig
+}
+
+/**
+ * `openclaw synthesis ...` admin commands. Used to inspect & poke the running
+ * pool from outside (helpful for testing without a real channel inbound).
+ *
+ * Subcommands (planned):
+ *   list                              — show live processes + mapping
+ *   push <session> <text>            — fake an inbound message
+ *   kill <session>                   — terminate a process (mapping preserved)
+ *   forget <session>                 — drop mapping entirely (next msg = new claude session)
+ */
+export function registerCli(api: OpenClawPluginApi, deps: CliDeps): void {
+  // The exact API shape for command registration depends on the OpenClaw
+  // plugin-sdk version. Two common forms seen in existing plugins:
+  //
+  //   api.commands?.register('synthesis', { describe, handler })
+  //   api.cli?.command('synthesis', sub => sub.command('list', '...', () => {...}))
+  //
+  // Both are stubbed below — pick whichever the loaded SDK exposes when
+  // wiring this for real.
+
+  const _ = { api, deps }
+  // TODO: wire actual command registration once the surrounding plugin
+  // patterns are confirmed (see contractor-agent/commands/register-cli.ts
+  // for the canonical example in this codebase).
+  void _
+}
diff --git a/SynthesisAgent.OpenclawPlugin/core/config.ts b/SynthesisAgent.OpenclawPlugin/core/config.ts
new file mode 100644
index 0000000..b8db286
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/core/config.ts
@@ -0,0 +1,42 @@
+import { homedir } from 'node:os'
+import { resolve as resolvePath } from 'node:path'
+
+export interface SynthesisConfig {
+  bridgePort: number
+  bridgeToken: string
+  claudePluginRef: string
+  permissionMode: string
+  idleKillMs: number
+  maxProcesses: number
+  mappingDbPath: string
+}
+
+const DEFAULTS: SynthesisConfig = {
+  bridgePort: 18801,
+  bridgeToken: 'synthesis-local',
+  claudePluginRef: 'plugin:synthesis-claude@local',
+  permissionMode: 'acceptEdits',
+  idleKillMs: 3_600_000,
+  maxProcesses: 16,
+  mappingDbPath: '~/.openclaw/synthesis/sessions.json',
+}
+
+function expand(p: string): string {
+  if (p.startsWith('~')) return resolvePath(homedir(), p.slice(2))
+  return resolvePath(p)
+}
+
+export function normalizeConfig(raw: unknown): SynthesisConfig {
+  const r = (raw ?? {}) as Partial<SynthesisConfig>
+  const merged: SynthesisConfig = {
+    bridgePort: typeof r.bridgePort === 'number' ? r.bridgePort : DEFAULTS.bridgePort,
+    bridgeToken: typeof r.bridgeToken === 'string' && r.bridgeToken ? r.bridgeToken : DEFAULTS.bridgeToken,
+    claudePluginRef: typeof r.claudePluginRef === 'string' && r.claudePluginRef ? r.claudePluginRef : DEFAULTS.claudePluginRef,
+    permissionMode: typeof r.permissionMode === 'string' && r.permissionMode ? r.permissionMode : DEFAULTS.permissionMode,
+    idleKillMs: typeof r.idleKillMs === 'number' ? r.idleKillMs : DEFAULTS.idleKillMs,
+    maxProcesses: typeof r.maxProcesses === 'number' ? r.maxProcesses : DEFAULTS.maxProcesses,
+    mappingDbPath: typeof r.mappingDbPath === 'string' && r.mappingDbPath ? r.mappingDbPath : DEFAULTS.mappingDbPath,
+  }
+  merged.mappingDbPath = expand(merged.mappingDbPath)
+  return merged
+}
diff --git a/SynthesisAgent.OpenclawPlugin/core/process-manager.ts b/SynthesisAgent.OpenclawPlugin/core/process-manager.ts
new file mode 100644
index 0000000..b3e6ff1
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/core/process-manager.ts
@@ -0,0 +1,162 @@
+import { spawn, type ChildProcess } from 'node:child_process'
+import type { SynthesisConfig } from './config.js'
+import type { SessionMapping } from './session-mapping.js'
+
+export interface ProcessHandle {
+  pid: number
+  openclawSessionId: string
+  claudeSessionUuid: string
+  proc: ChildProcess
+  startedAt: number
+  lastActiveAt: number
+  /** Resolved when the ClaudePlugin's hello frame has been seen on the bridge. */
+  ready: Promise<void>
+  markReady: () => void
+}
+
+export interface ProcessManagerDeps {
+  config: SynthesisConfig
+  mapping: SessionMapping
+}
+
+/**
+ * Owns the pool of `claude` subprocesses. One per openclaw_session, lazily
+ * spawned on first message and reaped after `idleKillMs` of inactivity.
+ *
+ * Hand-off to ClaudePlugin happens via env vars + a shared WebSocket bridge:
+ * we know a process is "live" when its plugin connects back and sends `hello`.
+ *
+ * Responsibilities NOT handled here (delegated):
+ *   - Routing inbound messages to a specific process → done by bridge-server,
+ *     which holds the ws connection per pid.
+ *   - Tool catalog → bridge-server sends in hello_ack.
+ */
+export class ProcessManager {
+  private byOpenclawSession = new Map<string, ProcessHandle>()
+  private idleSweeper: ReturnType<typeof setInterval> | null = null
+  private shuttingDown = false
+
+  constructor(private deps: ProcessManagerDeps) {
+    this.idleSweeper = setInterval(() => this.sweepIdle(), 60_000)
+  }
+
+  /** Returns the live handle, spawning if needed. Awaits hello handshake. */
+  async ensure(openclawSessionId: string): Promise<ProcessHandle> {
+    const existing = this.byOpenclawSession.get(openclawSessionId)
+    if (existing && !existing.proc.killed) {
+      existing.lastActiveAt = Date.now()
+      return existing
+    }
+
+    if (this.byOpenclawSession.size >= this.deps.config.maxProcesses) {
+      this.evictOldestIdle()
+    }
+
+    const rec = this.deps.mapping.ensure(openclawSessionId)
+    const handle = this.spawn(openclawSessionId, rec.claudeSessionUuid)
+    this.byOpenclawSession.set(openclawSessionId, handle)
+    // Wait for ClaudePlugin → bridge → bridge-server → handle.markReady().
+    await Promise.race([
+      handle.ready,
+      new Promise<void>((_, rej) => setTimeout(() => rej(new Error('claude spawn ready timeout')), 15_000)),
+    ])
+    this.deps.mapping.touch(openclawSessionId)
+    return handle
+  }
+
+  /** Bridge server calls this once it has paired a connection to a pid. */
+  markReady(pid: number): void {
+    for (const h of this.byOpenclawSession.values()) {
+      if (h.pid === pid) {
+        h.markReady()
+        return
+      }
+    }
+  }
+
+  private spawn(openclawSessionId: string, claudeSessionUuid: string): ProcessHandle {
+    const { config } = this.deps
+    const args = [
+      '--channels', config.claudePluginRef,
+      '--resume', claudeSessionUuid,
+      '--permission-mode', config.permissionMode,
+      // Tool allowlist scoped to our MCP namespace plus the basics models need
+      // for any non-trivial assist (Read, Edit, Bash). Tighten if/when policy
+      // demands.
+      '--allowed-tools', 'Read Edit Bash mcp__synthesis__*',
+    ]
+
+    const proc = spawn('claude', args, {
+      env: {
+        ...process.env,
+        SYNTHESIS_BRIDGE_URL: `ws://127.0.0.1:${config.bridgePort}/bridge`,
+        SYNTHESIS_BRIDGE_TOKEN: config.bridgeToken,
+        SYNTHESIS_OPENCLAW_SESSION: openclawSessionId,
+        SYNTHESIS_CLAUDE_SESSION: claudeSessionUuid,
+      },
+      stdio: ['ignore', 'pipe', 'pipe'],
+      detached: false,
+    })
+
+    let resolveReady!: () => void
+    const ready = new Promise<void>(r => { resolveReady = r })
+
+    const handle: ProcessHandle = {
+      pid: proc.pid ?? -1,
+      openclawSessionId,
+      claudeSessionUuid,
+      proc,
+      startedAt: Date.now(),
+      lastActiveAt: Date.now(),
+      ready,
+      markReady: () => resolveReady(),
+    }
+
+    proc.on('exit', code => {
+      this.byOpenclawSession.delete(openclawSessionId)
+      // mapping is preserved so the next message resumes via --resume
+      process.stderr.write(`synthesis: claude exit session=${openclawSessionId} pid=${handle.pid} code=${code}\n`)
+    })
+
+    proc.stderr?.on('data', chunk => {
+      process.stderr.write(`[claude:${handle.pid}] ${chunk}`)
+    })
+
+    return handle
+  }
+
+  private sweepIdle(): void {
+    if (this.shuttingDown) return
+    const cutoff = Date.now() - this.deps.config.idleKillMs
+    for (const h of this.byOpenclawSession.values()) {
+      if (h.lastActiveAt < cutoff) {
+        process.stderr.write(`synthesis: idle-killing session=${h.openclawSessionId} pid=${h.pid}\n`)
+        h.proc.kill('SIGTERM')
+      }
+    }
+  }
+
+  private evictOldestIdle(): void {
+    let oldest: ProcessHandle | null = null
+    for (const h of this.byOpenclawSession.values()) {
+      if (!oldest || h.lastActiveAt < oldest.lastActiveAt) oldest = h
+    }
+    if (oldest) {
+      process.stderr.write(`synthesis: evicting session=${oldest.openclawSessionId} (max processes reached)\n`)
+      oldest.proc.kill('SIGTERM')
+    }
+  }
+
+  list(): ProcessHandle[] {
+    return [...this.byOpenclawSession.values()]
+  }
+
+  async shutdown(): Promise<void> {
+    this.shuttingDown = true
+    if (this.idleSweeper) clearInterval(this.idleSweeper)
+    for (const h of this.byOpenclawSession.values()) {
+      try { h.proc.kill('SIGTERM') } catch { /* ignore */ }
+    }
+    this.byOpenclawSession.clear()
+  }
+}
diff --git a/SynthesisAgent.OpenclawPlugin/core/session-mapping.ts b/SynthesisAgent.OpenclawPlugin/core/session-mapping.ts
new file mode 100644
index 0000000..563b8cc
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/core/session-mapping.ts
@@ -0,0 +1,83 @@
+import { readFileSync, writeFileSync, mkdirSync } from 'node:fs'
+import { dirname } from 'node:path'
+import { randomUUID } from 'node:crypto'
+
+export interface SessionRecord {
+  openclawSessionId: string
+  claudeSessionUuid: string
+  createdAt: number
+  lastActiveAt: number
+}
+
+/**
+ * Persistent openclaw_session ↔ claude_session mapping.
+ *
+ * Single-writer (the OpenclawPlugin process). File-level on every mutation —
+ * simple and correct for the volume we expect. If it ever matters, swap for
+ * sqlite.
+ */
+export class SessionMapping {
+  private records = new Map<string, SessionRecord>()
+  private path: string
+
+  constructor(path: string) {
+    this.path = path
+    this.load()
+  }
+
+  private load(): void {
+    try {
+      const raw = readFileSync(this.path, 'utf8')
+      const parsed = JSON.parse(raw) as { records?: SessionRecord[] }
+      for (const r of parsed.records ?? []) {
+        this.records.set(r.openclawSessionId, r)
+      }
+    } catch {
+      // File doesn't exist or unreadable — start fresh.
+    }
+  }
+
+  private flush(): void {
+    mkdirSync(dirname(this.path), { recursive: true })
+    writeFileSync(
+      this.path,
+      JSON.stringify({ records: [...this.records.values()] }, null, 2),
+      'utf8',
+    )
+  }
+
+  get(openclawSessionId: string): SessionRecord | undefined {
+    return this.records.get(openclawSessionId)
+  }
+
+  /** Get-or-create. Returns the (possibly freshly assigned) claude_session_uuid. */
+  ensure(openclawSessionId: string): SessionRecord {
+    const existing = this.records.get(openclawSessionId)
+    if (existing) return existing
+    const now = Date.now()
+    const rec: SessionRecord = {
+      openclawSessionId,
+      claudeSessionUuid: randomUUID(),
+      createdAt: now,
+      lastActiveAt: now,
+    }
+    this.records.set(openclawSessionId, rec)
+    this.flush()
+    return rec
+  }
+
+  touch(openclawSessionId: string): void {
+    const r = this.records.get(openclawSessionId)
+    if (!r) return
+    r.lastActiveAt = Date.now()
+    this.flush()
+  }
+
+  forget(openclawSessionId: string): void {
+    if (this.records.delete(openclawSessionId)) this.flush()
+  }
+
+  all(): SessionRecord[] {
+    return [...this.records.values()]
+  }
+}
diff --git a/SynthesisAgent.OpenclawPlugin/index.ts b/SynthesisAgent.OpenclawPlugin/index.ts
new file mode 100644
index 0000000..1366202
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/index.ts
@@ -0,0 +1,68 @@
+import { definePluginEntry } from 'openclaw/plugin-sdk/plugin-entry'
+import type { OpenClawPluginApi } from 'openclaw/plugin-sdk/core'
+import { normalizeConfig, type SynthesisConfig } from './core/config.js'
+import { ProcessManager } from './core/process-manager.js'
+import { SessionMapping } from './core/session-mapping.js'
+import { startBridgeServer } from './web/bridge-server.js'
+import { registerCli } from './core/cli.js'
+
+// All long-lived state lives on globalThis so OpenClaw hot-reloads don't kill
+// running Claude processes (mirrors contractor-agent's convention).
+const _G = globalThis as Record<string, unknown>
+const PM_KEY = '_synthesisProcessManager'
+const SERVER_KEY = '_synthesisBridgeServer'
+const MAPPING_KEY = '_synthesisSessionMapping'
+
+export default definePluginEntry({
+  id: 'synthesis-agent',
+  name: 'SynthesisAgent',
+  description: 'Manages long-lived Claude Code processes per OpenClaw session',
+
+  register(api: OpenClawPluginApi): void {
+    const config: SynthesisConfig = normalizeConfig(api.pluginConfig)
+
+    // ── Reuse existing state across hot reload ─────────────────────────────
+    let mapping = _G[MAPPING_KEY] as SessionMapping | undefined
+    if (!mapping) {
+      mapping = new SessionMapping(config.mappingDbPath)
+      _G[MAPPING_KEY] = mapping
+    }
+
+    let pm = _G[PM_KEY] as ProcessManager | undefined
+    if (!pm) {
+      pm = new ProcessManager({ config, mapping })
+      _G[PM_KEY] = pm
+    }
+
+    // Existing bridge server: leave it alone.
+    if (!_G[SERVER_KEY]) {
+      startBridgeServer({ config, mapping, processManager: pm })
+        .then(server => { _G[SERVER_KEY] = server })
+        .catch(err => {
+          api.logger?.error?.('synthesis: bridge server failed to start', err)
+        })
+    }
+
+    // ── Wire to OpenClaw inbound event bus ─────────────────────────────────
+    // TODO: subscribe to api.events / api.channels.onInbound (exact API TBD).
+    // Each inbound message arrives with an openclaw_session_id; we forward to
+    // the process manager, which spawns/resumes claude as needed and pushes
+    // the message into its plugin's bridge socket.
+    //
+    //   api.channels.onInbound((evt) => {
+    //     pm.deliverInbound(evt.openclawSessionId, evt)
+    //   })
+    //
+    // Similarly for permission replies.
+
+    registerCli(api, { processManager: pm, mapping, config })
+
+    api.lifecycle?.onShutdown?.(async () => {
+      const server = _G[SERVER_KEY] as Awaited<ReturnType<typeof startBridgeServer>> | undefined
+      await server?.close?.()
+      delete _G[SERVER_KEY]
+      await pm!.shutdown()
+      delete _G[PM_KEY]
+    })
+  },
+})
diff --git a/SynthesisAgent.OpenclawPlugin/openclaw.plugin.json b/SynthesisAgent.OpenclawPlugin/openclaw.plugin.json
new file mode 100644
index 0000000..c966181
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/openclaw.plugin.json
@@ -0,0 +1,52 @@
+{
+  "id": "synthesis-agent",
+  "name": "SynthesisAgent",
+  "description": "Manages long-lived interactive Claude Code processes per OpenClaw session; bridges OpenClaw events <-> SynthesisAgent.ClaudePlugin",
+  "activation": {
+    "onStartup": true
+  },
+  "commandAliases": [
+    { "name": "synthesis" }
+  ],
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+      "bridgePort": {
+        "type": "number",
+        "default": 18801,
+        "description": "TCP port the bridge WebSocket server binds on (127.0.0.1)"
+      },
+      "bridgeToken": {
+        "type": "string",
+        "default": "synthesis-local",
+        "description": "Shared secret each ClaudePlugin instance must present in its hello frame"
+      },
+      "claudePluginRef": {
+        "type": "string",
+        "default": "plugin:synthesis-claude@local",
+        "description": "The --channels argument passed to claude on spawn"
+      },
+      "permissionMode": {
+        "type": "string",
+        "default": "acceptEdits",
+        "description": "Claude Code permission mode for spawned sessions"
+      },
+      "idleKillMs": {
+        "type": "number",
+        "default": 3600000,
+        "description": "Idle time after which a session's claude process is killed; next message resumes it"
+      },
+      "maxProcesses": {
+        "type": "number",
+        "default": 16,
+        "description": "Hard cap on concurrent claude processes; new sessions beyond this evict the oldest idle one"
+      },
+      "mappingDbPath": {
+        "type": "string",
+        "default": "~/.openclaw/synthesis/sessions.json",
+        "description": "Where openclaw_session <-> claude_session UUID mapping is persisted"
+      }
+    }
+  }
+}
diff --git a/SynthesisAgent.OpenclawPlugin/package.json b/SynthesisAgent.OpenclawPlugin/package.json
new file mode 100644
index 0000000..8fc3dfb
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "synthesis-agent-openclaw-plugin",
+  "version": "0.0.1",
+  "license": "Apache-2.0",
+  "description": "OpenClaw plugin: manages long-lived Claude Code processes per OpenClaw session for SynthesisAgent",
+  "type": "module",
+  "main": "index.ts",
+  "dependencies": {
+    "ws": "^8.18.0"
+  },
+  "devDependencies": {
+    "@types/ws": "^8.5.10",
+    "typescript": "^5.0.0",
+    "openclaw": "*"
+  }
+}
diff --git a/SynthesisAgent.OpenclawPlugin/tsconfig.json b/SynthesisAgent.OpenclawPlugin/tsconfig.json
new file mode 100644
index 0000000..5c2d790
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "resolveJsonModule": true,
+    "allowImportingTsExtensions": true,
+    "noEmit": true
+  },
+  "include": ["index.ts", "core/**/*.ts", "web/**/*.ts"]
+}
diff --git a/SynthesisAgent.OpenclawPlugin/web/bridge-server.ts b/SynthesisAgent.OpenclawPlugin/web/bridge-server.ts
new file mode 100644
index 0000000..ad9b387
--- /dev/null
+++ b/SynthesisAgent.OpenclawPlugin/web/bridge-server.ts
@@ -0,0 +1,146 @@
+import { WebSocketServer, type WebSocket } from 'ws'
+import type { SynthesisConfig } from '../core/config.js'
+import type { SessionMapping } from '../core/session-mapping.js'
+import type { ProcessManager } from '../core/process-manager.js'
+
+interface BridgeServerDeps {
+  config: SynthesisConfig
+  mapping: SessionMapping
+  processManager: ProcessManager
+}
+
+interface ClientConn {
+  ws: WebSocket
+  pid: number
+  openclawSessionId: string
+  claudeSessionUuid: string
+  isAlive: boolean
+}
+
+/**
+ * WebSocket server that ClaudePlugin instances dial into. One connection per
+ * spawned Claude process; identified by env-injected (openclaw_session, pid).
+ *
+ * Bridge frames are defined in docs/wire-protocol.md.
+ */
+export async function startBridgeServer(deps: BridgeServerDeps): Promise<{ close(): Promise<void> }> {
+  const { config, processManager } = deps
+
+  const wss = new WebSocketServer({
+    host: '127.0.0.1',
+    port: config.bridgePort,
+    path: '/bridge',
+  })
+
+  const byOpenclawSession = new Map<string, ClientConn>()
+
+  wss.on('connection', ws => {
+    let conn: ClientConn | null = null
+
+    ws.on('message', async raw => {
+      let frame: any
+      try { frame = JSON.parse(String(raw)) } catch { return }
+
+      // First frame must be hello.
+      if (!conn) {
+        if (frame.type !== 'hello') return ws.close(4001, 'expected hello first')
+        if (frame.token !== config.bridgeToken) return ws.close(4002, 'bad token')
+
+        conn = {
+          ws,
+          pid: frame.pid,
+          openclawSessionId: frame.openclaw_session,
+          claudeSessionUuid: frame.claude_session,
+          isAlive: true,
+        }
+
+        // Evict any previous connection for this session (e.g. plugin reconnect).
+        const prev = byOpenclawSession.get(conn.openclawSessionId)
+        if (prev && prev.ws !== ws) try { prev.ws.close(4003, 'replaced by reconnect') } catch {}
+        byOpenclawSession.set(conn.openclawSessionId, conn)
+
+        processManager.markReady(conn.pid)
+
+        ws.send(JSON.stringify({
+          type: 'hello_ack',
+          // TODO: real catalog from api.tools.list() — empty for the scaffold.
+          tools: [],
+          session_meta: { openclaw_session: conn.openclawSessionId },
+        }))
+        return
+      }
+
+      // Subsequent frames.
+      switch (frame.type) {
+        case 'tool_call':
+          // TODO: dispatch frame.tool with frame.args against OpenClaw's tool
+          // surface. For the scaffold we echo not-implemented.
+          ws.send(JSON.stringify({
+            type: 'tool_result',
+            call_id: frame.call_id,
+            ok: false,
+            error: `tool dispatch not implemented (tool=${frame.tool})`,
+          }))
+          return
+
+        case 'permission_request':
+          // TODO: route to the user via the original source channel
+          // (Discord/Telegram/…). The OpenClaw side knows where the session
+          // came from. For now, log and auto-deny.
+          process.stderr.write(`synthesis: permission_request ${frame.request_id} (auto-denied)\n`)
+          ws.send(JSON.stringify({
+            type: 'permission_reply',
+            request_id: frame.request_id,
+            behavior: 'deny',
+          }))
+          return
+
+        case 'pong':
+          conn.isAlive = true
+          return
+
+        default:
+          process.stderr.write(`synthesis: unknown frame type from plugin: ${frame.type}\n`)
+      }
+    })
+
+    ws.on('close', () => {
+      if (conn && byOpenclawSession.get(conn.openclawSessionId)?.ws === ws) {
+        byOpenclawSession.delete(conn.openclawSessionId)
+      }
+    })
+  })
+
+  // Heartbeat: ping every 30s, kill if no pong by next round.
+  const heartbeat = setInterval(() => {
+    for (const c of byOpenclawSession.values()) {
+      if (!c.isAlive) {
+        try { c.ws.terminate() } catch {}
+        continue
+      }
+      c.isAlive = false
+      try { c.ws.send(JSON.stringify({ type: 'ping', ts: Date.now() })) } catch {}
+    }
+  }, 30_000)
+
+  process.stderr.write(`synthesis: bridge listening on ws://127.0.0.1:${config.bridgePort}/bridge\n`)
+
+  return {
+    /** Public helper for outsiders (e.g. inbound event subscriber) to push messages. */
+    pushInbound(openclawSessionId: string, payload: { content: string; meta: Record<string, unknown>; request_id?: string }) {
+      const c = byOpenclawSession.get(openclawSessionId)
+      if (!c) throw new Error(`no live plugin for session ${openclawSessionId}`)
+      c.ws.send(JSON.stringify({ type: 'inbound_message', ...payload }))
+    },
+    pushPermissionReply(openclawSessionId: string, request_id: string, behavior: 'allow' | 'deny') {
+      const c = byOpenclawSession.get(openclawSessionId)
+      if (!c) throw new Error(`no live plugin for session ${openclawSessionId}`)
+      c.ws.send(JSON.stringify({ type: 'permission_reply', request_id, behavior }))
+    },
+    async close() {
+      clearInterval(heartbeat)
+      for (const c of byOpenclawSession.values()) try { c.ws.close() } catch {}
+      await new Promise<void>(r => wss.close(() => r()))
+    },
+  } as unknown as { close(): Promise<void> }
+}
diff --git a/docs/wire-protocol.md b/docs/wire-protocol.md
new file mode 100644
index 0000000..135b293
--- /dev/null
+++ b/docs/wire-protocol.md
@@ -0,0 +1,122 @@
+# Wire Protocol — OpenclawPlugin ↔ ClaudePlugin
+
+A WebSocket connection from each spawned ClaudePlugin instance back to OpenclawPlugin's bridge server. JSON messages, one per frame.
+
+## Connection bootstrap
+
+On spawn, OpenclawPlugin sets these env vars on the Claude process so ClaudePlugin can find its way home:
+
+| Env var                        | Purpose                                                       |
+|--------------------------------|---------------------------------------------------------------|
+| `SYNTHESIS_BRIDGE_URL`         | WebSocket URL, e.g. `ws://127.0.0.1:18801/bridge`             |
+| `SYNTHESIS_BRIDGE_TOKEN`       | Shared secret, validated server-side                          |
+| `SYNTHESIS_OPENCLAW_SESSION`   | The OpenClaw session ID this Claude process serves            |
+| `SYNTHESIS_CLAUDE_SESSION`     | The Claude session UUID (for traceability)                    |
+
+ClaudePlugin connects on startup and sends:
+
+```json
+{ "type": "hello",
+  "openclaw_session": "<sid>",
+  "claude_session":   "<uuid>",
+  "pid":              12345,
+  "token":            "<bridge_token>" }
+```
+
+OpenclawPlugin responds with:
+
+```json
+{ "type": "hello_ack", "tools": [ /* tool catalog */ ], "session_meta": { ... } }
+```
+
+If `hello` is rejected (bad token, unknown session), the server closes the socket.
+
+## Direction: OpenClaw → Claude (inbound events)
+
+```json
+{ "type": "inbound_message",
+  "request_id": "msg_abc123",
+  "content": "user message text",
+  "meta": {
+    "chat_id":   "<openclaw_session_id>",
+    "message_id": "...",
+    "user":       "alice",
+    "user_id":    "...",
+    "ts":         "2026-05-14T...Z",
+    "source_channel": "discord",
+    "attachments":    [ ... ]
+  }
+}
+```
+
+ClaudePlugin translates each `inbound_message` into:
+
+```json
+{ "method": "notifications/claude/channel",
+  "params": { "content": ..., "meta": ... } }
+```
+
+…and emits it on its MCP stdio. Claude Code reacts by starting a new turn.
+
+## Direction: OpenClaw → Claude (permission reply)
+
+When the user answers a permission prompt out of band (e.g. "yes abxyz" in Discord), OpenClaw forwards:
+
+```json
+{ "type": "permission_reply",
+  "request_id": "abxyz",
+  "behavior":   "allow" }
+```
+
+ClaudePlugin emits an MCP `notifications/claude/channel/permission` for that request_id.
+
+## Direction: Claude → OpenClaw (tool calls)
+
+Each `tools/call` Claude makes on ClaudePlugin (excluding internal ones the plugin owns) is forwarded over the bridge:
+
+```json
+{ "type": "tool_call",
+  "call_id":  "tc_001",
+  "tool":     "pcexec",
+  "args":     { ... } }
+```
+
+OpenclawPlugin invokes the corresponding OpenClaw tool and responds:
+
+```json
+{ "type": "tool_result",
+  "call_id": "tc_001",
+  "ok":      true,
+  "result":  { ... } }
+```
+
+…or with `"ok": false, "error": "..."`.
+
+## Direction: Claude → OpenClaw (permission request)
+
+When Claude Code asks for a permission via `notifications/claude/channel/permission_request`, ClaudePlugin forwards:
+
+```json
+{ "type": "permission_request",
+  "request_id": "<5 lowercase letters minus 'l'>",
+  "tool":       "Bash",
+  "args":       { ... },
+  "rationale":  "..." }
+```
+
+OpenclawPlugin routes this to the user via the source channel (e.g. posts a Discord message: "Approve? Reply `yes <code>`").
+
+## Direction: bidirectional health
+
+```json
+{ "type": "ping",  "ts": ... }
+{ "type": "pong",  "ts": ... }
+```
+
+OpenclawPlugin sends `ping` every 30s. ClaudePlugin missing 2 consecutive pings → server marks the connection dead, allows reconnect.
+
+## Reconnect semantics
+
+- ClaudePlugin reconnects on socket close with exponential backoff (1s, 2s, 4s, max 30s).
+- During disconnect, OpenclawPlugin buffers up to N inbound messages per session (configurable). Buffer overflow drops the oldest with a warning.
+- On reconnect, the `hello` message re-establishes session binding.