mcp.py
python
sha256:3c58668648c7323bb9f5c6881cfe6a3f14fc93fcb73b537d253732952a5bf8bf
chore: bump version to 0.2.0rc12
Sonnet 4.6
patch
8 days ago
| 1 | """MuseHub MCP — Full Streamable HTTP transport (MCP 2025-11-25). |
| 2 | |
| 3 | Implements the complete Streamable HTTP transport spec: |
| 4 | |
| 5 | POST /mcp — client → server messages (requests, notifications, responses). |
| 6 | - Returns ``application/json`` for most requests (resources, prompts, ping). |
| 7 | - Returns ``text/event-stream`` when a tool needs SSE (elicitation, progress). |
| 8 | - Returns 202 Accepted for notifications (no body). |
| 9 | - Issues ``Mcp-Session-Id`` header on successful ``initialize``. |
| 10 | - Validates ``Mcp-Session-Id`` on all subsequent requests. |
| 11 | - Validates ``MCP-Protocol-Version`` header on non-initialize requests. |
| 12 | - Validates ``Origin`` header to prevent DNS-rebinding attacks. |
| 13 | |
| 14 | GET /mcp — server → client SSE push channel. |
| 15 | - Opens a persistent ``text/event-stream`` for server-initiated messages. |
| 16 | - Supports ``Last-Event-ID`` for reconnection replay. |
| 17 | - Injects heartbeat comments every 15 s to keep proxies alive. |
| 18 | |
| 19 | DELETE /mcp — client-initiated session termination. |
| 20 | - Returns 200 on success, 404 if session unknown. |
| 21 | |
| 22 | Auth model: |
| 23 | - ``Authorization: MSign handle="..." ts=... sig="..."`` → authenticated; handle from MSign context. |
| 24 | - No token → anonymous; read-only tools work, write tools return isError=true. |
| 25 | - Invalid signature → 401. |
| 26 | |
| 27 | Security: |
| 28 | - Origin header validated on all POST/GET/DELETE requests. |
| 29 | - Allowed origins configured via ``MUSEHUB_ALLOWED_ORIGINS`` env var |
| 30 | (comma-separated). Defaults to localhost in dev mode. |
| 31 | """ |
| 32 | |
| 33 | import json |
| 34 | import logging |
| 35 | import os |
| 36 | from collections.abc import AsyncIterator |
| 37 | from urllib.parse import urlparse |
| 38 | |
| 39 | from fastapi import APIRouter, Depends, Request, Response |
| 40 | from musehub.auth.request_signing import MSignContext, optional_signed_request |
| 41 | from fastapi.responses import JSONResponse, StreamingResponse |
| 42 | from musehub.rate_limits import limiter, MCP_LIMIT |
| 43 | |
| 44 | from musehub.types.json_types import JSONObject, JSONValue |
| 45 | from musehub.mcp.dispatcher import handle_batch, handle_request |
| 46 | from musehub.mcp.tools import MUSEHUB_WRITE_TOOL_NAMES |
| 47 | from musehub.mcp.session import ( |
| 48 | MCPSession, |
| 49 | SessionCapacityError, |
| 50 | create_session, |
| 51 | delete_session, |
| 52 | get_session, |
| 53 | push_to_session, |
| 54 | register_sse_queue, |
| 55 | resolve_elicitation, |
| 56 | ) |
| 57 | from musehub.mcp.sse import SSE_CONTENT_TYPE, heartbeat_stream, sse_heartbeat |
| 58 | |
| 59 | logger = logging.getLogger(__name__) |
| 60 | |
| 61 | router = APIRouter(tags=["MCP"]) |
| 62 | |
| 63 | _PROTOCOL_VERSION = "2025-11-25" |
| 64 | |
| 65 | # ── Origin validation ───────────────────────────────────────────────────────── |
| 66 | |
| 67 | _ALLOWED_ORIGINS: frozenset[str] = frozenset( |
| 68 | o.strip() |
| 69 | for o in os.environ.get( |
| 70 | "MUSEHUB_ALLOWED_ORIGINS", |
| 71 | "http://localhost,http://127.0.0.1,https://musehub.ai", |
| 72 | ).split(",") |
| 73 | if o.strip() |
| 74 | ) |
| 75 | |
| 76 | _ALWAYS_ALLOW_ORIGINS: frozenset[str] = frozenset({ |
| 77 | "http://localhost", |
| 78 | "http://127.0.0.1", |
| 79 | }) |
| 80 | |
| 81 | |
| 82 | def _validate_origin(request: Request) -> bool: |
| 83 | """Return True if the request origin is allowed. |
| 84 | |
| 85 | Per the Streamable HTTP spec, servers MUST validate Origin to prevent |
| 86 | DNS-rebinding attacks. Requests without an Origin header are allowed |
| 87 | (e.g. curl, Postman, stdio bridge tools). |
| 88 | """ |
| 89 | origin = request.headers.get("Origin") |
| 90 | if origin is None: |
| 91 | return True # Non-browser clients don't send Origin. |
| 92 | |
| 93 | # Normalise: strip path component, keep scheme+host+port. |
| 94 | try: |
| 95 | parsed = urlparse(origin) |
| 96 | normalised = f"{parsed.scheme}://{parsed.netloc}" |
| 97 | except Exception: |
| 98 | return False |
| 99 | |
| 100 | return normalised in _ALLOWED_ORIGINS or normalised in _ALWAYS_ALLOW_ORIGINS |
| 101 | |
| 102 | |
| 103 | # ── Auth helper ─────────────────────────────────────────────────────────────── |
| 104 | |
| 105 | |
| 106 | |
| 107 | # ── POST /mcp ───────────────────────────────────────────────────────────────── |
| 108 | |
| 109 | |
| 110 | @router.post( |
| 111 | "/mcp", |
| 112 | operation_id="mcpEndpoint", |
| 113 | summary="MCP Streamable HTTP — POST endpoint (2025-11-25)", |
| 114 | include_in_schema=True, |
| 115 | ) |
| 116 | @limiter.limit(MCP_LIMIT) |
| 117 | async def mcp_post( |
| 118 | request: Request, |
| 119 | ctx: MSignContext | None = Depends(optional_signed_request), |
| 120 | ) -> Response: |
| 121 | """MCP Streamable HTTP POST endpoint. |
| 122 | |
| 123 | Handles all client→server JSON-RPC messages. Returns ``application/json`` |
| 124 | for most requests, ``text/event-stream`` when the response requires SSE |
| 125 | (tool calls that use elicitation or progress streaming), and |
| 126 | ``202 Accepted`` for notifications. |
| 127 | |
| 128 | The ``initialize`` method issues an ``Mcp-Session-Id`` response header. |
| 129 | All subsequent requests must include that header. |
| 130 | """ |
| 131 | # ── Security: Origin validation ─────────────────────────────────────────── |
| 132 | if not _validate_origin(request): |
| 133 | return JSONResponse( |
| 134 | status_code=403, |
| 135 | content={ |
| 136 | "jsonrpc": "2.0", |
| 137 | "id": None, |
| 138 | "error": {"code": -32600, "message": "Forbidden: invalid Origin header"}, |
| 139 | }, |
| 140 | ) |
| 141 | |
| 142 | # ── Auth ────────────────────────────────────────────────────────────────── |
| 143 | # ctx is None for anonymous requests (no MSign header or invalid signature |
| 144 | # that optional_signed_request let through as None). If a MSign header IS |
| 145 | # present but ctx is None, the signature failed — return 401. |
| 146 | auth_header = request.headers.get("Authorization", "") |
| 147 | if auth_header.startswith("MSign ") and ctx is None: |
| 148 | return JSONResponse( |
| 149 | status_code=401, |
| 150 | content={"error": "Invalid MSign signature."}, |
| 151 | headers={"WWW-Authenticate": 'MSign realm="musehub"'}, |
| 152 | ) |
| 153 | user_id: str | None = ctx.handle if ctx else None |
| 154 | is_agent: bool = ctx.is_agent if ctx else False |
| 155 | agent_name: str | None = (ctx.handle if ctx.is_agent else None) if ctx else None |
| 156 | |
| 157 | # ── Parse body ──────────────────────────────────────────────────────────── |
| 158 | try: |
| 159 | body = await request.body() |
| 160 | raw = json.loads(body) |
| 161 | except (json.JSONDecodeError, ValueError) as exc: |
| 162 | return JSONResponse( |
| 163 | status_code=400, |
| 164 | content={ |
| 165 | "jsonrpc": "2.0", |
| 166 | "id": None, |
| 167 | "error": {"code": -32700, "message": f"Parse error: {exc}"}, |
| 168 | }, |
| 169 | ) |
| 170 | |
| 171 | # ── Determine if this is initialize or a subsequent request ────────────── |
| 172 | # For batches, use the method of the first request. |
| 173 | def _first_method(r: JSONObject | list[JSONObject]) -> str | None: |
| 174 | if isinstance(r, dict): |
| 175 | m = r.get("method") |
| 176 | return m if isinstance(m, str) else None |
| 177 | if isinstance(r, list) and r: |
| 178 | return r[0].get("method") if isinstance(r[0], dict) else None |
| 179 | return None |
| 180 | |
| 181 | first_method = _first_method(raw) |
| 182 | is_initialize = first_method == "initialize" |
| 183 | |
| 184 | # ── Session management ──────────────────────────────────────────────────── |
| 185 | session: MCPSession | None = None |
| 186 | session_id_header = request.headers.get("Mcp-Session-Id") |
| 187 | |
| 188 | if not is_initialize: |
| 189 | # Validate MCP-Protocol-Version on non-initialize requests. |
| 190 | proto_ver = request.headers.get("MCP-Protocol-Version") |
| 191 | if proto_ver and proto_ver not in ("2025-11-25", "2025-03-26"): |
| 192 | return JSONResponse( |
| 193 | status_code=400, |
| 194 | content={ |
| 195 | "jsonrpc": "2.0", |
| 196 | "id": None, |
| 197 | "error": { |
| 198 | "code": -32600, |
| 199 | "message": f"Unsupported MCP-Protocol-Version: {proto_ver!r}", |
| 200 | }, |
| 201 | }, |
| 202 | ) |
| 203 | |
| 204 | if session_id_header: |
| 205 | session = get_session(session_id_header) |
| 206 | if session is None: |
| 207 | # Session expired or unknown → client must re-initialize. |
| 208 | # NOTE: multi-worker deployments using in-process session storage |
| 209 | # require sticky sessions at the load-balancer level so that all |
| 210 | # requests for a given Mcp-Session-Id land on the same worker. |
| 211 | # See nginx upstream hash $http_mcp_session_id consistent for |
| 212 | # a production-ready solution. |
| 213 | return JSONResponse( |
| 214 | status_code=404, |
| 215 | content={ |
| 216 | "jsonrpc": "2.0", |
| 217 | "id": None, |
| 218 | "error": { |
| 219 | "code": -32600, |
| 220 | "message": "Session not found. Send a new InitializeRequest without Mcp-Session-Id.", |
| 221 | }, |
| 222 | }, |
| 223 | ) |
| 224 | |
| 225 | # ── Write tool re-verification ──────────────────────────────────────────── |
| 226 | # Session identity is established at initialize, but a stolen session ID |
| 227 | # must not allow write access. For every tools/call that targets a write |
| 228 | # tool, require a fresh MSign signature on *this* request (ctx != None). |
| 229 | # Read tools, resource reads, prompts, and notifications pass through. |
| 230 | if not is_initialize and isinstance(raw, dict) and raw.get("method") == "tools/call": |
| 231 | params = raw.get("params") |
| 232 | tool_name = params.get("name") if isinstance(params, dict) else None |
| 233 | if tool_name in MUSEHUB_WRITE_TOOL_NAMES and ctx is None: |
| 234 | req_id = raw.get("id") |
| 235 | return JSONResponse( |
| 236 | status_code=401, |
| 237 | content={ |
| 238 | "jsonrpc": "2.0", |
| 239 | "id": req_id, |
| 240 | "error": { |
| 241 | "code": -32001, |
| 242 | "message": ( |
| 243 | "Write tools require a fresh MSign signature on each request. " |
| 244 | "Include Authorization: MSign ... on this call." |
| 245 | ), |
| 246 | }, |
| 247 | }, |
| 248 | headers={"WWW-Authenticate": 'MSign realm="musehub"'}, |
| 249 | ) |
| 250 | |
| 251 | # ── Check if this is an elicitation response (client→server) ───────────── |
| 252 | # When the client sends the result of an elicitation/create back, it's a |
| 253 | # JSON-RPC *response* (has "result" or "error" but no "method"). Route it |
| 254 | # to the session's pending Future resolver. |
| 255 | if session and isinstance(raw, dict) and "method" not in raw and "id" in raw: |
| 256 | req_id = raw.get("id") |
| 257 | if "result" in raw and req_id is not None: |
| 258 | resolved = resolve_elicitation(session, req_id, raw["result"]) |
| 259 | if resolved: |
| 260 | return Response(status_code=202) |
| 261 | # Unknown response — ignore per spec. |
| 262 | return Response(status_code=202) |
| 263 | |
| 264 | # ── Dispatch ────────────────────────────────────────────────────────────── |
| 265 | try: |
| 266 | if isinstance(raw, list): |
| 267 | responses = await handle_batch( |
| 268 | raw, user_id=user_id, session=session, |
| 269 | is_agent=is_agent, agent_name=agent_name, |
| 270 | ) |
| 271 | if not responses: |
| 272 | return Response(status_code=202) |
| 273 | return JSONResponse(content=responses) |
| 274 | |
| 275 | elif isinstance(raw, dict): |
| 276 | # Detect if tool needs SSE streaming (elicitation tools set this). |
| 277 | needs_sse = _method_needs_sse(raw) and session is not None |
| 278 | |
| 279 | if needs_sse and session is not None: |
| 280 | return _make_sse_tool_response( |
| 281 | raw, user_id=user_id, session=session, |
| 282 | is_agent=is_agent, agent_name=agent_name, |
| 283 | ) |
| 284 | |
| 285 | resp = await handle_request( |
| 286 | raw, user_id=user_id, session=session, |
| 287 | is_agent=is_agent, agent_name=agent_name, |
| 288 | ) |
| 289 | if resp is None: |
| 290 | return Response(status_code=202) |
| 291 | |
| 292 | # Attach Mcp-Session-Id on initialize. |
| 293 | if is_initialize: |
| 294 | try: |
| 295 | new_session = _create_session_from_initialize(raw, user_id) |
| 296 | except SessionCapacityError as cap_exc: |
| 297 | logger.warning("MCP session capacity exceeded: %s", cap_exc) |
| 298 | return JSONResponse( |
| 299 | status_code=503, |
| 300 | content={ |
| 301 | "jsonrpc": "2.0", |
| 302 | "id": None, |
| 303 | "error": { |
| 304 | "code": -32000, |
| 305 | "message": str(cap_exc), |
| 306 | }, |
| 307 | }, |
| 308 | headers={"Retry-After": "5"}, |
| 309 | ) |
| 310 | return JSONResponse( |
| 311 | content=resp, |
| 312 | headers={"Mcp-Session-Id": new_session.session_id}, |
| 313 | ) |
| 314 | |
| 315 | return JSONResponse(content=resp) |
| 316 | |
| 317 | else: |
| 318 | return JSONResponse( |
| 319 | status_code=400, |
| 320 | content={ |
| 321 | "jsonrpc": "2.0", |
| 322 | "id": None, |
| 323 | "error": { |
| 324 | "code": -32600, |
| 325 | "message": "Request must be an object or array", |
| 326 | }, |
| 327 | }, |
| 328 | ) |
| 329 | |
| 330 | except Exception as exc: |
| 331 | logger.exception("Unhandled error in POST /mcp: %s", exc) |
| 332 | return JSONResponse( |
| 333 | status_code=500, |
| 334 | content={ |
| 335 | "jsonrpc": "2.0", |
| 336 | "id": None, |
| 337 | "error": {"code": -32603, "message": f"Internal error: {exc}"}, |
| 338 | }, |
| 339 | ) |
| 340 | |
| 341 | |
| 342 | # ── GET /mcp ────────────────────────────────────────────────────────────────── |
| 343 | |
| 344 | |
| 345 | @router.get( |
| 346 | "/mcp", |
| 347 | operation_id="mcpSseStream", |
| 348 | summary="MCP Streamable HTTP — GET SSE push channel (2025-11-25)", |
| 349 | include_in_schema=True, |
| 350 | ) |
| 351 | async def mcp_get(request: Request) -> Response: |
| 352 | """Open a persistent SSE stream for server-initiated messages. |
| 353 | |
| 354 | The client MUST include ``Accept: text/event-stream`` and a valid |
| 355 | ``Mcp-Session-Id``. Returns 405 if SSE is not accepted. |
| 356 | |
| 357 | Supports ``Last-Event-ID`` header for reconnection and event replay. |
| 358 | Heartbeat comments are sent every 15 s to keep proxies alive. |
| 359 | |
| 360 | Server-initiated messages delivered on this stream: |
| 361 | - ``notifications/progress`` — tool progress updates. |
| 362 | - ``elicitation/create`` — requests for user input. |
| 363 | - ``notifications/elicitation/complete`` — URL mode completion signals. |
| 364 | """ |
| 365 | if not _validate_origin(request): |
| 366 | return Response(status_code=403) |
| 367 | |
| 368 | accept = request.headers.get("Accept", "") |
| 369 | if "text/event-stream" not in accept: |
| 370 | return Response(status_code=405, content="SSE requires Accept: text/event-stream") |
| 371 | |
| 372 | session_id = request.headers.get("Mcp-Session-Id") |
| 373 | if not session_id: |
| 374 | return JSONResponse( |
| 375 | status_code=400, |
| 376 | content={"error": "Mcp-Session-Id header required for GET /mcp SSE stream"}, |
| 377 | ) |
| 378 | |
| 379 | session = get_session(session_id) |
| 380 | if session is None: |
| 381 | return Response(status_code=404, content="Session not found or expired") |
| 382 | |
| 383 | last_event_id = request.headers.get("Last-Event-ID") |
| 384 | |
| 385 | async def event_generator() -> AsyncIterator[str]: |
| 386 | async for event_text in heartbeat_stream( |
| 387 | register_sse_queue(session, last_event_id), |
| 388 | interval_seconds=15.0, |
| 389 | ): |
| 390 | yield event_text |
| 391 | |
| 392 | return StreamingResponse( |
| 393 | event_generator(), |
| 394 | media_type=SSE_CONTENT_TYPE, |
| 395 | headers={ |
| 396 | "Cache-Control": "no-cache", |
| 397 | "X-Accel-Buffering": "no", # Disable nginx buffering. |
| 398 | }, |
| 399 | ) |
| 400 | |
| 401 | |
| 402 | # ── DELETE /mcp ─────────────────────────────────────────────────────────────── |
| 403 | |
| 404 | |
| 405 | @router.delete( |
| 406 | "/mcp", |
| 407 | operation_id="mcpDeleteSession", |
| 408 | summary="MCP Streamable HTTP — DELETE session (2025-11-25)", |
| 409 | include_in_schema=True, |
| 410 | ) |
| 411 | async def mcp_delete(request: Request) -> Response: |
| 412 | """Client-initiated session termination. |
| 413 | |
| 414 | Closes all open SSE streams for the session and cancels any pending |
| 415 | elicitation Futures. Returns 200 on success, 404 if unknown. |
| 416 | """ |
| 417 | if not _validate_origin(request): |
| 418 | return Response(status_code=403) |
| 419 | |
| 420 | session_id = request.headers.get("Mcp-Session-Id") |
| 421 | if not session_id: |
| 422 | return JSONResponse( |
| 423 | status_code=400, |
| 424 | content={"error": "Mcp-Session-Id header required"}, |
| 425 | ) |
| 426 | |
| 427 | deleted = delete_session(session_id) |
| 428 | if not deleted: |
| 429 | return Response(status_code=404, content="Session not found") |
| 430 | |
| 431 | logger.info("MCP session terminated by client: %.8s...", session_id) |
| 432 | return Response(status_code=200) |
| 433 | |
| 434 | |
| 435 | # ── GET /mcp/docs.json ──────────────────────────────────────────────────────── |
| 436 | |
| 437 | |
| 438 | @router.get( |
| 439 | "/mcp/docs.json", |
| 440 | operation_id="mcpDocsJson", |
| 441 | summary="MCP capability manifest — machine-readable JSON", |
| 442 | include_in_schema=True, |
| 443 | ) |
| 444 | async def mcp_docs_json() -> JSONResponse: |
| 445 | """Return a machine-readable JSON manifest of all MCP capabilities. |
| 446 | |
| 447 | This endpoint is the programmatic complement to ``GET /mcp/docs``. |
| 448 | AI agents and tool integrators can fetch this to discover: |
| 449 | - The full tool catalogue (names, descriptions, input schemas) |
| 450 | - All static and templated resources (URIs, names, descriptions) |
| 451 | - All available prompts (names, descriptions, arguments) |
| 452 | - Server info and protocol version |
| 453 | |
| 454 | No authentication required — this is intentionally public so agents |
| 455 | can bootstrap without prior credentials. |
| 456 | """ |
| 457 | from musehub.mcp.tools import MCP_TOOLS |
| 458 | from musehub.mcp.resources import STATIC_RESOURCES, RESOURCE_TEMPLATES |
| 459 | from musehub.mcp.prompts import PROMPT_CATALOGUE |
| 460 | |
| 461 | tools_out = [ |
| 462 | {k: v for k, v in t.items() if k != "server_side"} |
| 463 | for t in MCP_TOOLS |
| 464 | ] |
| 465 | resources_out = [ |
| 466 | { |
| 467 | "uri": r.get("uri"), |
| 468 | "name": r.get("name"), |
| 469 | "description": r.get("description"), |
| 470 | "mimeType": r.get("mimeType"), |
| 471 | } |
| 472 | for r in STATIC_RESOURCES |
| 473 | ] |
| 474 | templates_out = [ |
| 475 | { |
| 476 | "uriTemplate": t.get("uriTemplate"), |
| 477 | "name": t.get("name"), |
| 478 | "description": t.get("description"), |
| 479 | "mimeType": t.get("mimeType"), |
| 480 | } |
| 481 | for t in RESOURCE_TEMPLATES |
| 482 | ] |
| 483 | prompts_out = [ |
| 484 | { |
| 485 | "name": p["name"], |
| 486 | "description": p["description"], |
| 487 | "arguments": p.get("arguments", []), |
| 488 | } |
| 489 | for p in PROMPT_CATALOGUE |
| 490 | ] |
| 491 | |
| 492 | return JSONResponse( |
| 493 | content={ |
| 494 | "server": { |
| 495 | "name": "musehub-mcp", |
| 496 | "version": "0.2.0", |
| 497 | "protocolVersion": _PROTOCOL_VERSION, |
| 498 | "endpoint": "/mcp", |
| 499 | "docsUrl": "/mcp/docs", |
| 500 | }, |
| 501 | "tools": tools_out, |
| 502 | "resources": resources_out, |
| 503 | "resourceTemplates": templates_out, |
| 504 | "prompts": prompts_out, |
| 505 | }, |
| 506 | headers={"Cache-Control": "public, max-age=300"}, |
| 507 | ) |
| 508 | |
| 509 | |
| 510 | # ── GET /mcp/docs ───────────────────────────────────────────────────────────── |
| 511 | |
| 512 | |
| 513 | @router.get( |
| 514 | "/mcp/docs", |
| 515 | operation_id="mcpDocs", |
| 516 | summary="MCP reference — human-readable documentation page", |
| 517 | include_in_schema=True, |
| 518 | ) |
| 519 | async def mcp_docs(request: Request) -> Response: |
| 520 | """Render a human-readable reference page for the MuseHub MCP server. |
| 521 | |
| 522 | Lists all tools, resources, resource templates, and prompts with their |
| 523 | descriptions and input schemas. Also shows: |
| 524 | - Connection instructions (endpoint URL, auth model, protocol version) |
| 525 | - Agent onboarding quick-start guide |
| 526 | - Link to ``/mcp/docs.json`` for machine-readable access |
| 527 | |
| 528 | No authentication required. |
| 529 | """ |
| 530 | try: |
| 531 | from musehub.api.routes.musehub._templates import templates |
| 532 | from musehub.mcp.tools import MCP_TOOLS |
| 533 | from musehub.mcp.resources import STATIC_RESOURCES, RESOURCE_TEMPLATES |
| 534 | from musehub.mcp.prompts import PROMPT_CATALOGUE |
| 535 | |
| 536 | ctx = { |
| 537 | "request": request, |
| 538 | "tools": MCP_TOOLS, |
| 539 | "static_resources": STATIC_RESOURCES, |
| 540 | "resource_templates": RESOURCE_TEMPLATES, |
| 541 | "prompts": PROMPT_CATALOGUE, |
| 542 | "protocol_version": _PROTOCOL_VERSION, |
| 543 | } |
| 544 | return templates.TemplateResponse(request, "musehub/pages/mcp_docs.html", ctx) |
| 545 | except Exception as exc: |
| 546 | logger.warning("MCP docs template missing, falling back to JSON redirect: %s", exc) |
| 547 | from fastapi.responses import RedirectResponse |
| 548 | return RedirectResponse(url="/mcp/docs.json") |
| 549 | |
| 550 | |
| 551 | # ── Helpers ─────────────────────────────────────────────────────────────────── |
| 552 | |
| 553 | |
| 554 | def _create_session_from_initialize( |
| 555 | raw: JSONObject, |
| 556 | user_id: str | None, |
| 557 | ) -> MCPSession: |
| 558 | """Extract client capabilities from initialize params and create a session.""" |
| 559 | params = raw.get("params") or {} |
| 560 | client_caps: JSONObject = {} |
| 561 | if isinstance(params, dict): |
| 562 | caps = params.get("capabilities") |
| 563 | if isinstance(caps, dict): |
| 564 | client_caps = caps |
| 565 | return create_session(user_id, client_capabilities=client_caps) |
| 566 | |
| 567 | |
| 568 | # Tools that may use elicitation or progress streaming (SSE required). |
| 569 | _SSE_TOOL_NAMES: frozenset[str] = frozenset({ |
| 570 | "musehub_review_proposal_interactive", |
| 571 | "musehub_create_release_interactive", |
| 572 | }) |
| 573 | |
| 574 | |
| 575 | def _method_needs_sse(raw: JSONObject) -> bool: |
| 576 | """Return True if this request should be streamed as SSE.""" |
| 577 | if raw.get("method") != "tools/call": |
| 578 | return False |
| 579 | params = raw.get("params") |
| 580 | if not isinstance(params, dict): |
| 581 | return False |
| 582 | name = params.get("name") |
| 583 | return name in _SSE_TOOL_NAMES |
| 584 | |
| 585 | |
| 586 | def _make_sse_tool_response( |
| 587 | raw: JSONObject, |
| 588 | *, |
| 589 | user_id: str | None, |
| 590 | session: MCPSession, |
| 591 | is_agent: bool = False, |
| 592 | agent_name: str | None = None, |
| 593 | ) -> StreamingResponse: |
| 594 | """Return a StreamingResponse that runs the tool and streams results via SSE.""" |
| 595 | from musehub.mcp.sse import sse_response, sse_notification |
| 596 | |
| 597 | raw_id = raw.get("id") |
| 598 | req_id: str | int | None = raw_id if isinstance(raw_id, (str, int)) else None |
| 599 | |
| 600 | async def generator() -> AsyncIterator[str]: |
| 601 | try: |
| 602 | result = await handle_request( |
| 603 | raw, user_id=user_id, session=session, |
| 604 | is_agent=is_agent, agent_name=agent_name, |
| 605 | ) |
| 606 | if result is not None: |
| 607 | yield sse_response(req_id, result) |
| 608 | except Exception as exc: |
| 609 | logger.exception("SSE tool call error: %s", exc) |
| 610 | error_payload: JSONObject = { |
| 611 | "jsonrpc": "2.0", |
| 612 | "id": req_id, |
| 613 | "error": {"code": -32603, "message": str(exc)}, |
| 614 | } |
| 615 | from musehub.mcp.sse import sse_event |
| 616 | yield sse_event(error_payload) |
| 617 | |
| 618 | return StreamingResponse( |
| 619 | generator(), |
| 620 | media_type=SSE_CONTENT_TYPE, |
| 621 | headers={ |
| 622 | "Cache-Control": "no-cache", |
| 623 | "X-Accel-Buffering": "no", |
| 624 | }, |
| 625 | ) |
File History
1 commit
sha256:3c58668648c7323bb9f5c6881cfe6a3f14fc93fcb73b537d253732952a5bf8bf
chore: bump version to 0.2.0rc12
Sonnet 4.6
patch
8 days ago