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---
summary: "Run the ACP bridge for IDE integrations"
read_when:
- Setting up ACP-based IDE integrations
- Debugging ACP session routing to the Gateway
title: "acp"
---
# acp
Run the [Agent Client Protocol (ACP)](https://agentclientprotocol.com/) bridge that talks to an OpenClaw 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.
`openclaw acp` is a Gateway-backed ACP bridge, not a full ACP-native editor
runtime. It focuses on session routing, prompt delivery, and basic streaming
updates.
If you want an external MCP client to talk directly to OpenClaw channel
conversations instead of hosting an ACP harness session, use
[`openclaw mcp serve`](/cli/mcp) instead.
## What this is not
This page is often confused with ACP harness sessions.
`openclaw acp` means:
- OpenClaw acts as an ACP server
- an IDE or ACP client connects to OpenClaw
- OpenClaw forwards that work into a Gateway session
This is different from [ACP Agents](/tools/acp-agents), where OpenClaw runs an
external harness such as Codex or Claude Code through `acpx`.
Quick rule:
- editor/client wants to talk ACP to OpenClaw: use `openclaw acp`
- OpenClaw should launch Codex/Claude/Gemini as an ACP harness: use `/acp spawn` and [ACP Agents](/tools/acp-agents)
## Compatibility Matrix
| ACP area | Status | Notes |
| --------------------------------------------------------------------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `initialize`, `newSession`, `prompt`, `cancel` | Implemented | Core bridge flow over stdio to Gateway chat/send + abort. |
| `listSessions`, slash commands | Implemented | Session list works against Gateway session state; commands are advertised via `available_commands_update`. |
| `loadSession` | Partial | Rebinds the ACP session to a Gateway session key and replays stored user/assistant text history. Tool/system history is not reconstructed yet. |
| Prompt content (`text`, embedded `resource`, images) | Partial | Text/resources are flattened into chat input; images become Gateway attachments. |
| Session modes | Partial | `session/set_mode` is supported and the bridge exposes initial Gateway-backed session controls for thought level, tool verbosity, reasoning, usage detail, and elevated actions. Broader ACP-native mode/config surfaces are still out of scope. |
| Session info and usage updates | Partial | The bridge emits `session_info_update` and best-effort `usage_update` notifications from cached Gateway session snapshots. Usage is approximate and only sent when Gateway token totals are marked fresh. |
| Tool streaming | Partial | `tool_call` / `tool_call_update` events include raw I/O, text content, and best-effort file locations when Gateway tool args/results expose them. Embedded terminals and richer diff-native output are still not exposed. |
| Per-session MCP servers (`mcpServers`) | Unsupported | Bridge mode rejects per-session MCP server requests. Configure MCP on the OpenClaw gateway or agent instead. |
| Client filesystem methods (`fs/read_text_file`, `fs/write_text_file`) | Unsupported | The bridge does not call ACP client filesystem methods. |
| Client terminal methods (`terminal/*`) | Unsupported | The bridge does not create ACP client terminals or stream terminal ids through tool calls. |
| Session plans / thought streaming | Unsupported | The bridge currently emits output text and tool status, not ACP plan or thought updates. |
## Known Limitations
- `loadSession` replays stored user and assistant text history, but it does not
reconstruct historic tool calls, system notices, or richer ACP-native event
types.
- If multiple ACP clients share the same Gateway session key, event and cancel
routing are best-effort rather than strictly isolated per client. Prefer the
default isolated `acp:<uuid>` sessions when you need clean editor-local
turns.
- Gateway stop states are translated into ACP stop reasons, but that mapping is
less expressive than a fully ACP-native runtime.
- Initial session controls currently surface a focused subset of Gateway knobs:
thought level, tool verbosity, reasoning, usage detail, and elevated
actions. Model selection and exec-host controls are not yet exposed as ACP
config options.
- `session_info_update` and `usage_update` are derived from Gateway session
snapshots, not live ACP-native runtime accounting. Usage is approximate,
carries no cost data, and is only emitted when the Gateway marks total token
data as fresh.
- Tool follow-along data is best-effort. The bridge can surface file paths that
appear in known tool args/results, but it does not yet emit ACP terminals or
structured file diffs.
## Usage
```bash
openclaw acp
# Remote Gateway
openclaw acp --url wss://gateway-host:18789 --token <token>
# Remote Gateway (token from file)
openclaw acp --url wss://gateway-host:18789 --token-file ~/.openclaw/gateway.token
# Attach to an existing session key
openclaw acp --session agent:main:main
# Attach by label (must already exist)
openclaw acp --session-label "support inbox"
# Reset the session key before the first prompt
openclaw acp --session agent:main:main --reset-session
```
## ACP client (debug)
Use the built-in ACP client to sanity-check the bridge without an IDE.
It spawns the ACP bridge and lets you type prompts interactively.
```bash
openclaw acp client
# Point the spawned bridge at a remote Gateway
openclaw acp client --server-args --url wss://gateway-host:18789 --token-file ~/.openclaw/gateway.token
# Override the server command (default: openclaw)
openclaw acp client --server "node" --server-args openclaw.mjs acp --url ws://127.0.0.1:19001
```
Permission model (client debug mode):
- Auto-approval is allowlist-based and only applies to trusted core tool IDs.
- `read` auto-approval is scoped to the current working directory (`--cwd` when set).
- ACP only auto-approves narrow readonly classes: scoped `read` calls under the active cwd plus readonly search tools (`search`, `web_search`, `memory_search`). Unknown/non-core tools, out-of-scope reads, exec-capable tools, control-plane tools, mutating tools, and interactive flows always require explicit prompt approval.
- Server-provided `toolCall.kind` is treated as untrusted metadata (not an authorization source).
- This ACP bridge policy is separate from ACPX harness permissions. If you run OpenClaw through the `acpx` backend, `plugins.entries.acpx.config.permissionMode=approve-all` is the break-glass “yolo” switch for that harness session.
## How to use this
Use ACP when an IDE (or other client) speaks Agent Client Protocol and you want
it to drive an OpenClaw 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 `openclaw acp` over stdio.
Example config (persisted):
```bash
openclaw config set gateway.remote.url wss://gateway-host:18789
openclaw config set gateway.remote.token <token>
```
Example direct run (no config write):
```bash
openclaw acp --url wss://gateway-host:18789 --token <token>
# preferred for local process safety
openclaw acp --url wss://gateway-host:18789 --token-file ~/.openclaw/gateway.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
openclaw acp --session agent:main:main
openclaw acp --session agent:design:main
openclaw 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.
Per-session `mcpServers` are not supported in bridge mode. If an ACP client
sends them during `newSession` or `loadSession`, the bridge returns a clear
error instead of silently ignoring them.
If you want ACPX-backed sessions to see OpenClaw plugin tools, enable the
gateway-side ACPX plugin bridge instead of trying to pass per-session
`mcpServers`. See [ACP Agents](/tools/acp-agents#plugin-tools-mcp-bridge).
## Use from `acpx` (Codex, Claude, other ACP clients)
If you want a coding agent such as Codex or Claude Code to talk to your
OpenClaw bot over ACP, use `acpx` with its built-in `openclaw` target.
Typical flow:
1. Run the Gateway and make sure the ACP bridge can reach it.
2. Point `acpx openclaw` at `openclaw acp`.
3. Target the OpenClaw session key you want the coding agent to use.
Examples:
```bash
# One-shot request into your default OpenClaw ACP session
acpx openclaw exec "Summarize the active OpenClaw session state."
# Persistent named session for follow-up turns
acpx openclaw sessions ensure --name codex-bridge
acpx openclaw -s codex-bridge --cwd /path/to/repo \
"Ask my OpenClaw work agent for recent context relevant to this repo."
```
If you want `acpx openclaw` to target a specific Gateway and session key every
time, override the `openclaw` agent command in `~/.acpx/config.json`:
```json
{
"agents": {
"openclaw": {
"command": "env OPENCLAW_HIDE_BANNER=1 OPENCLAW_SUPPRESS_NOTES=1 openclaw acp --url ws://127.0.0.1:18789 --token-file ~/.openclaw/gateway.token --session agent:main:main"
}
}
}
```
For a repo-local OpenClaw checkout, use the direct CLI entrypoint instead of the
dev runner so the ACP stream stays clean. For example:
```bash
env OPENCLAW_HIDE_BANNER=1 OPENCLAW_SUPPRESS_NOTES=1 node openclaw.mjs acp ...
```
This is the easiest way to let Codex, Claude Code, or another ACP-aware client
pull contextual information from an OpenClaw agent without scraping a terminal.
## Zed editor setup
Add a custom ACP agent in `~/.config/zed/settings.json` (or use Zed’s Settings UI):
```json
{
"agent_servers": {
"OpenClaw ACP": {
"type": "custom",
"command": "openclaw",
"args": ["acp"],
"env": {}
}
}
}
```
To target a specific Gateway or agent:
```json
{
"agent_servers": {
"OpenClaw ACP": {
"type": "custom",
"command": "openclaw",
"args": [
"acp",
"--url",
"wss://gateway-host:18789",
"--token",
"<token>",
"--session",
"agent:design:main"
],
"env": {}
}
}
}
```
In Zed, open the Agent panel and select “OpenClaw 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.
- `--token-file <path>`: read Gateway auth token from file.
- `--password <password>`: Gateway auth password.
- `--password-file <path>`: read Gateway auth password from file.
- `--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.
- `--provenance <off|meta|meta+receipt>`: include ACP provenance metadata or receipts.
- `--verbose, -v`: verbose logging to stderr.
Security note:
- `--token` and `--password` can be visible in local process listings on some systems.
- Prefer `--token-file`/`--password-file` or environment variables (`OPENCLAW_GATEWAY_TOKEN`, `OPENCLAW_GATEWAY_PASSWORD`).
- Gateway auth resolution follows the shared contract used by other Gateway clients:
- local mode: env (`OPENCLAW_GATEWAY_*`) -> `gateway.auth.*` -> `gateway.remote.*` fallback only when `gateway.auth.*` is unset (configured-but-unresolved local SecretRefs fail closed)
- remote mode: `gateway.remote.*` with env/config fallback per remote precedence rules
- `--url` is override-safe and does not reuse implicit config/env credentials; pass explicit `--token`/`--password` (or file variants)
- ACP runtime backend child processes receive `OPENCLAW_SHELL=acp`, which can be used for context-specific shell/profile rules.
- `openclaw acp client` sets `OPENCLAW_SHELL=acp-client` on the spawned bridge process.
### `acp client` options
- `--cwd <dir>`: working directory for the ACP session.
- `--server <command>`: ACP server command (default: `openclaw`).
- `--server-args <args...>`: extra arguments passed to the ACP server.
- `--server-verbose`: enable verbose logging on the ACP server.
- `--verbose, -v`: verbose client logging.