feat(gateway): add MCP server endpoint with streamable HTTP transport #137

jason.woltje · 2026-03-15T18:05:04Z

jason.woltje commented

2026-03-15 18:05:04 +00:00

Summary

Adds and to
Creates with , , , , and in
Implements MCP streamable HTTP transport at (POST for JSON-RPC, GET for SSE reconnect)
Exposes 14 tools across three domains: brain (projects, tasks, missions, conversations), memory (search, preferences, insights), and coord (mission status, task listing)
Requires valid BetterAuth session for all MCP connections (401 Unauthorized if missing)
Stateful session management: each initialized client gets its own + pair, keyed by header
Uses the same low-level Fastify hook pattern as the auth handler

Test plan

Gateway starts without errors with new MCP module wired in
POST /mcp without auth returns 401
POST /mcp with valid session and initialize payload creates session and returns Mcp-Session-Id header
Subsequent requests with Mcp-Session-Id routed to correct transport
tools/list returns all 14 registered tools
tools/call executes brain/memory/coord tools correctly
Unknown Mcp-Session-Id returns 404
Gateway shutdown closes all open MCP sessions

Closes #52

🤖 Generated with Claude Code

## Summary - Adds and to - Creates with , , , , and in - Implements MCP streamable HTTP transport at (POST for JSON-RPC, GET for SSE reconnect) - Exposes 14 tools across three domains: brain (projects, tasks, missions, conversations), memory (search, preferences, insights), and coord (mission status, task listing) - Requires valid BetterAuth session for all MCP connections (401 Unauthorized if missing) - Stateful session management: each initialized client gets its own + pair, keyed by header - Uses the same low-level Fastify hook pattern as the auth handler ## Test plan - [ ] Gateway starts without errors with new MCP module wired in - [ ] POST /mcp without auth returns 401 - [ ] POST /mcp with valid session and initialize payload creates session and returns Mcp-Session-Id header - [ ] Subsequent requests with Mcp-Session-Id routed to correct transport - [ ] tools/list returns all 14 registered tools - [ ] tools/call executes brain/memory/coord tools correctly - [ ] Unknown Mcp-Session-Id returns 404 - [ ] Gateway shutdown closes all open MCP sessions Closes #52 🤖 Generated with [Claude Code](https://claude.com/claude-code)

jason.woltje added 2 commits 2026-03-15 18:05:05 +00:00

feat(web): wire WebSocket chat with streaming and conversation switching (#120 ) a8dc498794

- Fix socket singleton lifecycle: add destroySocket() and auto-reset on disconnect
  so page remounts always get a fresh authenticated connection
- Add explicit WebSocket transport preference to avoid polling fallback
- Filter socket events by conversationId to prevent cross-conversation bleed
  when switching between conversations mid-stream
- Use activeIdRef pattern so event handlers see current activeId without
  stale closures or listener re-registration on every render
- On agent:end, append accumulated text as assistant message to local state
  (matching TUI pattern; Pi session is in-memory so DB reload would miss it)
- Preserve REST persist of user messages for conversation history on reload
- Clear streaming state on conversation switch
- StreamingMessage: show animated typing indicator before first token arrives

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

feat(gateway): add MCP server endpoint with streamable HTTP transport (#52 )

ci/woodpecker/push/ci Pipeline was successful

Details

e2de76ca9f

- Install @modelcontextprotocol/sdk and zod in apps/gateway
- Create McpModule with McpService and controller at /mcp endpoint
- Implement stateful streamable HTTP transport (MCP spec 2025-03-26)
- Expose 14 tools: brain (projects/tasks/missions), memory, coord
- Require valid BetterAuth session for all MCP connections
- Per-session McpServer + StreamableHTTPServerTransport instances
- Follows same Fastify onRequest hook pattern as auth handler
- Add mcp.dto.ts with McpToolDescriptor and McpServerInfo interfaces

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

jason.woltje merged commit 8633823257 into main

2026-03-15 18:11:51 +00:00

jason.woltje referenced this issue from a commit

2026-03-15 18:11:52 +00:00

feat(gateway): add MCP server endpoint with streamable HTTP transport (#137)

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Reference: mosaicstack/stack#137