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.
• Analytics: Never send raw strings from the client to analytics. Tools with a command parameter must declare its values with an enum (for example EnumSchema.untitledSingleSelect), because only those values are included in the logged tool name. Similarly, new prompts must be added to the PromptNames enum, because only those prompt names are logged. Create analytics events with createDartMCPEvent from pkgs/dart_mcp_server/lib/src/utils/analytics.dart, which sanitizes the client info.

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.