Streamable HTTP Migrator

# Streamable HTTP Migrator Skill ## Trigger: /mcp-transport-migrate [server-directory] When invoked: 1. Scan current transport implementation: - Identify HTTP+SSE endpoint patterns - Map event stream connections - Check session management approach - Document current reconnection logic 2. Generate migration plan: ### Endpoint Changes | Before (HTTP+SSE) | After (Streamable HTTP) | |-------------------|------------------------| | POST /message + GET /sse | POST /mcp (single endpoint) | | SSE event stream | Response body streaming | | Custom session cookies | Mcp-Session-Id header | ### Required Code Changes ```typescript // Before: separate SSE endpoint app.get('/sse', (req, res) => { res.setHeader('Content-Type', 'text/event-stream'); // ... SSE logic }); // After: single Streamable HTTP endpoint app.post('/mcp', (req, res) => { const sessionId = req.headers['mcp-session-id']; // Validate Origin header if (!isValidOrigin(req.headers.origin)) { return res.status(403).json({ error: 'Invalid origin' }); } // Stream response using chunked transfer res.setHeader('Content-Type', 'application/json'); // ... handle request with optional streaming }); ``` 3. Security checklist: - [ ] Origin header validation on all requests - [ ] Mcp-Session-Id header generation and validation - [ ] DNS rebinding protection - [ ] Proper CORS configuration - [ ] Session cleanup on DELETE /mcp 4. Output: migration diff + rollback script + test suite