Accessibility MCP Server

# Add New Audit Tool ## Purpose Add a new accessibility audit tool following the adapter pattern and ensuring proper integration. ## Required Steps 1. **Create Adapter** (`src/adapters/{tool}-adapter.ts`): - Implement tool-specific execution logic - Handle errors and timeouts - Return typed result matching `src/types/audit.ts` 2. **Define Types** (`src/types/audit.ts`): - Add result interface for new tool - Include all fields from tool output - Ensure type safety 3. **Add Normalisation** (`src/services/normalisation/normaliser.ts`): - Implement `normalise{Tool}Result()` method - Map tool output to `NormalisedResult` schema - Add WCAG mappings in `src/utils/wcag.ts` 4. **Update Audit Executor** (`src/services/audits/audit-executor.ts`): - Add `execute{Tool}Audit()` method - Use adapter and normaliser 5. **Register MCP Tool** (`src/tools/index.ts`): - Add tool definition to `TOOLS` array - Add handler case in `tools/call` handler 6. **Add WCAG Mappings** (`src/utils/wcag.ts`): - Add rule ID to WCAG reference mappings - Define severity for each rule 7. **Sample Output**: - Create sample output fixture in `tests/fixtures/` - Test normalisation with sample data ## Schema Definition New tool must define: - Raw result type in `src/types/audit.ts` - Normalisation method in `Normaliser` class - WCAG mappings for all rules ## Validation - Adapter must handle all error cases - Normalisation must produce valid `NormalisedResult` - All rules must have WCAG references - Tool must be registered in MCP server