add-mcp-feature

name	add_mcp_feature
description	Instructions for adding new features (tools, prompts, etc.) to the dart_mcp_server package.

Adding Features to dart_mcp_server

Follow these instructions when adding new tools, prompts, or other capabilities to the dart_mcp_server.

1. Locate or Create a Mixin

All server features are implemented as mixins on the DartMCPServer at pkgs/dart_mcp_server/lib/src/server.dart.

• Check existing mixins: Look under pkgs/dart_mcp_server/lib/src/mixins/ to see if your feature fits into an existing category (e.g., analyzer.dart, pub.dart).
• Create a new mixin: If your feature is distinct, create a new file in that directory, following the patterns in existing mixins. Make sure to include a copyright header at the top of the file, with the current year.

2. Implementation Details

• Registration: Tools, prompts, etc should be registered in the initialize method of the mixin, which is an override and must call super.initialize().
• Parameter Names: When adding new arguments to tools or prompts, always add a constant to the ParameterNames extension in pkgs/dart_mcp_server/lib/src/utils/names.dart and use that constant instead of hardcoding string literals in your tool parsing and schema.

3. Testing

Always add tests for any new features.

• Test Harness: Use the TestHarness class located in pkgs/dart_mcp_server/test/test_harness.dart.
• Existing Tests: Look at pkgs/dart_mcp_server/test/tools/ for examples of how to test specific tools.
• Enhance Harness: If the current TestHarness lacks functionality needed for your test, feel free to add it.

4. Verification

• Run tests
• Run analysis
• Format the code

5. Documentation

• Run the pkgs/dart_mcp_server/tool/update_readme.dart script to update the README.md file with any new features, it must be ran from the pkgs/dart_mcp_server directory.
• Apply any other manual edits to the README.md file as needed.
• Update the CHANGELOG.md file to include any user facing updates.

6. Update this skill

• Update this SKILL.md file if that would be helpful for future features.