Tools now return CallToolResult directly instead of Content arrays,
preventing the MCP SDK from auto-generating structuredContent as a
JSON array (which Claude Code rejects — expects a JSON object/record).
Also adds Accept header to test helpers and SSE response parsing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- McpStdioAuthSubscriber for console transport auth via env vars
- DashboardStatsTool as PoC (validates MCP protocol flow)
- McpToolHelper trait for shared pagination/error utilities
- Key learning: #[McpTool] must be on CLASS, not method for __invoke
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>