feat(acp): add experimental ACP support

Co-authored-by: Jonathan Taylor <visionik@pobox.com>

docs/cli/acp.md

@@ -0,0 +1,143 @@
+---
+summary: "Run the ACP bridge for IDE integrations"
+read_when:
+  - Setting up ACP-based IDE integrations
+  - Debugging ACP session routing to the Gateway
+---
+
+# acp
+
+Run the ACP (Agent Client Protocol) bridge that talks to a Clawdbot Gateway.
+
+This command speaks ACP over stdio for IDEs and forwards prompts to the Gateway
+over WebSocket. It keeps ACP sessions mapped to Gateway session keys.
+
+## Usage
+
+```bash
+clawdbot acp
+
+# Remote Gateway
+clawdbot acp --url wss://gateway-host:18789 --token <token>
+
+# Attach to an existing session key
+clawdbot acp --session agent:main:main
+
+# Attach by label (must already exist)
+clawdbot acp --session-label "support inbox"
+
+# Reset the session key before the first prompt
+clawdbot acp --session agent:main:main --reset-session
+```
+
+## How to use this
+
+Use ACP when an IDE (or other client) speaks Agent Client Protocol and you want
+it to drive a Clawdbot Gateway session.
+
+1. Ensure the Gateway is running (local or remote).
+2. Configure the Gateway target (config or flags).
+3. Point your IDE to run `clawdbot acp` over stdio.
+
+Example config (persisted):
+
+```bash
+clawdbot config set gateway.remote.url wss://gateway-host:18789
+clawdbot config set gateway.remote.token <token>
+```
+
+Example direct run (no config write):
+
+```bash
+clawdbot acp --url wss://gateway-host:18789 --token <token>
+```
+
+## Selecting agents
+
+ACP does not pick agents directly. It routes by the Gateway session key.
+
+Use agent-scoped session keys to target a specific agent:
+
+```bash
+clawdbot acp --session agent:main:main
+clawdbot acp --session agent:design:main
+clawdbot acp --session agent:qa:bug-123
+```
+
+Each ACP session maps to a single Gateway session key. One agent can have many
+sessions; ACP defaults to an isolated `acp:<uuid>` session unless you override
+the key or label.
+
+## Zed editor setup
+
+Add a custom ACP agent in `~/.config/zed/settings.json` (or use Zed’s Settings UI):
+
+```json
+{
+  "agent_servers": {
+    "Clawdbot ACP": {
+      "type": "custom",
+      "command": "clawdbot",
+      "args": ["acp"],
+      "env": {}
+    }
+  }
+}
+```
+
+To target a specific Gateway or agent:
+
+```json
+{
+  "agent_servers": {
+    "Clawdbot ACP": {
+      "type": "custom",
+      "command": "clawdbot",
+      "args": [
+        "acp",
+        "--url", "wss://gateway-host:18789",
+        "--token", "<token>",
+        "--session", "agent:design:main"
+      ],
+      "env": {}
+    }
+  }
+}
+```
+
+In Zed, open the Agent panel and select “Clawdbot ACP” to start a thread.
+
+## Session mapping
+
+By default, ACP sessions get an isolated Gateway session key with an `acp:` prefix.
+To reuse a known session, pass a session key or label:
+
+- `--session <key>`: use a specific Gateway session key.
+- `--session-label <label>`: resolve an existing session by label.
+- `--reset-session`: mint a fresh session id for that key (same key, new transcript).
+
+If your ACP client supports metadata, you can override per session:
+
+```json
+{
+  "_meta": {
+    "sessionKey": "agent:main:main",
+    "sessionLabel": "support inbox",
+    "resetSession": true
+  }
+}
+```
+
+Learn more about session keys at [/concepts/session](/concepts/session).
+
+## Options
+
+- `--url <url>`: Gateway WebSocket URL (defaults to gateway.remote.url when configured).
+- `--token <token>`: Gateway auth token.
+- `--password <password>`: Gateway auth password.
+- `--session <key>`: default session key.
+- `--session-label <label>`: default session label to resolve.
+- `--require-existing`: fail if the session key/label does not exist.
+- `--reset-session`: reset the session key before first use.
+- `--no-prefix-cwd`: do not prefix prompts with the working directory.
+- `--verbose, -v`: verbose logging to stderr.

docs/cli/index.md

@@ -23,6 +23,7 @@ This page describes the current CLI behavior. If commands change, update this do
 - [`message`](/cli/message)
 - [`agent`](/cli/agent)
 - [`agents`](/cli/agents)
+- [`acp`](/cli/acp)
 - [`status`](/cli/status)
 - [`health`](/cli/health)
 - [`sessions`](/cli/sessions)
@@ -126,6 +127,7 @@ clawdbot [--dev] [--profile <name>] <command>
     list
     add
     delete
+  acp
   status
   health
   sessions
@@ -501,6 +503,11 @@ Options:
 - `--force`
 - `--json`
 
+### `acp`
+Run the ACP bridge that connects IDEs to the Gateway.
+
+See [`acp`](/cli/acp) for full options and examples.
+
 ### `status`
 Show linked session health and recent recipients.