feat: add OpenClaw support — self-update, skills, and extensions

[kianwoon]

Summary

Add support for updating OpenClaw — the open-source autonomous AI agent platform (318K+ GitHub stars, viral in China). OpenClaw has its own plugin ecosystem (skills + extensions) that can be bulk-managed.

Background

OpenClaw (formerly Clawdbot/Moltbot) is a local-first AI agent by Peter Steinberger that runs as a gateway daemon. It has:

• npm-based installation: npm install -g openclaw@latest
• Built-in update command: openclaw update --channel stable|beta|dev
• Skills system: ~/.openclaw/workspace/skills/<skill>/SKILL.md (bundled, global, or workspace-scoped)
• Extensions directory: extensions/ in the repo (TypeScript-based)
• Config: ~/.openclaw/openclaw.json (JSON)

Scope

Phase 1: Self-update

• Detect if OpenClaw is installed (which openclaw or check package.json global)
• Run openclaw update --channel stable (or respect user's channel preference)
• Report current version vs. latest available

Phase 2: Skills updates

• Discover skills at ~/.openclaw/workspace/skills/
• Determine which skills are git-backed vs. bundled vs. manually installed
• git pull on git-backed skills
• Skip bundled skills (they update with OpenClaw itself)

Phase 3: Extensions (future)

• Explore the extensions/ directory structure and update mechanism
• May require OpenClaw's own extension manager — needs research

Implementation approach

1. Add OpenClaw detection to the tool discovery phase (check for openclaw binary)
2. Add --tool openclaw flag support
3. Implement self-update via openclaw update
4. Scan ~/.openclaw/workspace/skills/ for git-backed skills
5. Reuse existing git pull logic from Claude Code marketplace updates

Considerations

• OpenClaw requires Node ≥22
• The gateway daemon may need restart after update
• Skills precedence: workspace > global > bundled — only update git-backed ones
• Config format is JSON (~/.openclaw/openclaw.json)
• China users may need npm mirror support

References

• GitHub: https://github.com/openclaw/openclaw
• Docs: https://docs.openclaw.ai
• Wikipedia: https://en.wikipedia.org/wiki/OpenClaw