OpenClaw Runtime Plugin

Drives the local openclaw CLI (openclaw/openclaw) as a subprocess. By default it runs openclaw agent --local (embedded mode, no daemon required); you can opt into the WebSocket gateway with useGateway: true.

What it does

For each promptWithFallback(session, prompt):

1. Spawns openclaw --no-color agent --local --json --session-id <uuid> --message <prompt> (plus --agent, --model, --thinking, --timeout if configured).
2. Reads the single JSON document on stdout (matching OpenClawAgentJson):
   • Concatenates payloads[] where !isError && !isReasoning → session.callbacks.onText(...).
   • Joins payloads[].isReasoning === true → session.callbacks.onThinking(...).
   • Surfaces tool-level errors (payloads[].isError === true) as a logger warning.
   • Stores meta.agentMeta.usage on the session for token accounting.
3. Reuses the same UUID across every prompt for the session so OpenClaw resumes the same agent conversation server-side.

The previous HTTP /v1/chat/completions integration has been removed — that endpoint required a separate gateway daemon and was an OpenAI-compat shim. The CLI surface is the canonical OpenClaw API.

Fusion tool-control (MCP bridge)

When a Fusion OpenClaw session includes custom tools, the runtime plugin now enables tool-control through OpenClaw's supported MCP configuration flow:

1. Collect session tools and filter out built-ins: read, write, edit, bash, grep, find.
2. Convert remaining tools into MCP-compatible schemas.
3. Write a temporary schema file and MCP server config (node mcp-schema-server.cjs <schema.json>).
4. Configure a profile-scoped MCP server using openclaw --profile <id> mcp set fusion-custom-tools <json>.
5. Spawn the agent turn with openclaw --profile <id> agent ... so OpenClaw can see the configured MCP server.

No private protocol is used — this is the verified OpenClaw CLI contract (mcp set + --profile).

Prerequisites

npm install -g openclaw

Verify with openclaw --version (expect OpenClaw 2026.x.y).

If you want gateway mode (useGateway: true), also start openclaw gateway run separately.

First-run note: the very first openclaw agent invocation lazy-installs runtime deps and can take 30–60s. Subsequent calls are fast.

Settings

Key	Env var	Default	Notes
binaryPath	OPENCLAW_BIN	openclaw	Path to the openclaw binary.
agentId	OPENCLAW_AGENT_ID	main	Maps to --agent <id>. List with openclaw agents list.
model	OPENCLAW_MODEL	(OpenClaw default)	Maps to --model <provider/model>, e.g. anthropic/claude-haiku-4-5.
thinking	OPENCLAW_THINKING	off	One of `off
cliTimeoutSec	OPENCLAW_TIMEOUT_SEC	0	OpenClaw-side timeout (0 = no limit).
cliTimeoutMs	OPENCLAW_CLI_TIMEOUT_MS	300000	Hard kill on the Fusion side.
useGateway	OPENCLAW_USE_GATEWAY	false	When true, omit --local; the CLI tries the WS gateway and falls back to embedded after ~2 s.

Settings precedence: plugin settings → env var → default.

Limitations

• No per-token streaming. --json emits a single JSON document at process exit. onText is called exactly once.
• Default ignores the gateway. With useGateway: false (default) we always pass --local, skipping the WebSocket connect attempt entirely. Most users want this.
• Built-in tools are intentionally excluded from MCP bridge. read, write, edit, bash, grep, and find stay native to Fusion and are not duplicated through OpenClaw MCP.
• AbortSignal sends SIGTERM. If the CLI ignores it (e.g. during a long model download), the hard-kill timer (cliTimeoutMs) eventually fires.

Public API

import {
  OpenClawRuntimeAdapter,
  resolveCliConfig,
  buildOpenClawArgs,
  createCliSession,
  promptCli,
  describeCliModel,
  extractStderrError,
  probeOpenClawBinary,
  type CliConfig,
  type GatewaySession,
  type OpenClawAgentJson,
  type OpenClawBinaryStatus,
} from "@fusion-plugin-examples/openclaw-runtime";

probeOpenClawBinary({ binaryPath?, timeoutMs? }) runs openclaw --version and returns { available, version, binaryPath, reason, probeDurationMs } — used by the dashboard's "Runtimes → OpenClaw" settings card.

Agent configuration

To create a Fusion agent backed by OpenClaw, set runtimeConfig.runtimeHint:

{
  "name": "OpenClaw Executor",
  "role": "executor",
  "runtimeConfig": {
    "runtimeHint": "openclaw"
  }
}

Runtime selection happens in the dashboard's New Agent → Plugin Runtime → OpenClaw.

Metadata

• Plugin ID: fusion-plugin-openclaw-runtime
• Runtime ID: openclaw
• Package: @fusion-plugin-examples/openclaw-runtime

Development

pnpm --filter @fusion-plugin-examples/openclaw-runtime test    # 44 tests
pnpm --filter @fusion-plugin-examples/openclaw-runtime build