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feat: hot-reload config files for MCP server changes #9849

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feat: hot-reload config files for MCP server changes #9849

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@R44VC0RP R44VC0RP commented Jan 21, 2026

Summary

Adds automatic config file watching to FileWatcher that triggers Instance.dispose() when config files change. This enables hot-reloading of MCP servers and other config-driven features without restarting the server.

Use case: Running opencode serve on a remote server, then adding/modifying opencode.json with new MCP servers - the changes now take effect automatically.

Changes

  • Expanded FileWatcher to watch config files (opencode.json, opencode.jsonc, config.json)
  • Watches multiple locations:
    • Project root (Instance.directory)
    • Project .opencode/ subdirectory (if exists)
    • User home ~/.opencode/ (if exists)
    • Global config ~/.config/opencode/
  • Per-instance debounce (500ms) and in-flight guard to prevent dispose storms
  • Works for all projects (not just git repos)
  • Added OPENCODE_DISABLE_CONFIG_WATCHER flag to opt out
  • Added Event.ConfigChanged bus event for subscribers

Testing

  • Verified TypeScript compiles without errors
  • Verified bun dev --help runs successfully

@R44VC0RP
feat: hot-reload config files for MCP server changes
b5d9b4c 
Add automatic config file watching to FileWatcher that triggers
Instance.dispose() when opencode.json, opencode.jsonc, or config.json
changes. This enables hot-reloading of MCP servers and other config
without restarting the server.

Changes:
- Watch project root, .opencode/, ~/.opencode/, and ~/.config/opencode/
- Per-instance debounce (500ms) and in-flight guard to prevent storms
- Works for all projects (not just git repos)
- Add OPENCODE_DISABLE_CONFIG_WATCHER flag to opt out
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github-actions bot commented Jan 21, 2026

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

  1. Open an issue describing the bug/feature (if one doesn't exist)
  2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

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github-actions bot commented Jan 21, 2026

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found one potentially related PR:

Related PR:

The searches primarily returned PR #9849 (the current PR), suggesting there are no other open PRs directly addressing config file hot-reloading or MCP server dynamic reloading at this time.

@R44VC0RP R44VC0RP marked this pull request as draft January 21, 2026 16:13
@R44VC0RP
test: add config watcher tests
3d18c36 
Test cases for the config hot-reload feature:
- Detects opencode.json changes
- Watches .opencode directory
- Debounces rapid changes
- Watches config.json and opencode.jsonc
- Ignores non-config files
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