441 lines
22 KiB
Python
441 lines
22 KiB
Python
"""MCP connection/transport error classification: URL validation, TLS client certs, identity
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headers, redirect header stripping, exception-group unwrapping, auth/session-expired/
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method-not-found detection and connect-error formatting. Split from tools/mcp_tool.py."""
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import asyncio
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import contextlib
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import errno
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import importlib
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import logging
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import os
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import re
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from typing import Any, List, Optional
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from urllib.parse import urlparse
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from tools.mcp_tool_common import _sanitize_error, _core
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logger = logging.getLogger("tools.mcp_tool")
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# Stateless (2026-07-28) servers reject a legacy ``initialize`` with this or plain method-not-found.
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_JSONRPC_UNSUPPORTED_PROTOCOL_VERSION = -32022
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def _jsonrpc_matches(exc: BaseException, codes: tuple, markers: tuple, code=None) -> bool:
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"""Structural ``MCPError.error.code`` (or *code*) in *codes*, else any *marker* in ``str(exc).lower()``. Never
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``isinstance`` on SDK exception types: they arrive wrapped in ExceptionGroups and drift across generations."""
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code = getattr(getattr(exc, "error", None), "code", None) or code
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return code in codes or any(marker in str(exc).lower() for marker in markers)
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def _handshake_rejected_as_modern(exc: BaseException) -> bool:
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"""True when a failed ``initialize`` signals a stateless-only (2026-07-28) server."""
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return _jsonrpc_matches(
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exc, (_JSONRPC_UNSUPPORTED_PROTOCOL_VERSION, _core._JSONRPC_METHOD_NOT_FOUND),
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("unsupported protocol version", str(_JSONRPC_UNSUPPORTED_PROTOCOL_VERSION)),
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code=getattr(exc, "code", None)) or _is_method_not_found_error(exc)
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def _is_method_not_found_error(exc: BaseException) -> bool:
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"""True if *exc* is a JSON-RPC ``method not found`` (-32601; ``ping`` is optional in MCP). The
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substring fallback includes "Unknown method: <name>" — without it the ping→list_tools keepalive
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fallback never latches and reconnect-loops.
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The substring fallback matters when a server reports method-not-found without a structural ``-32601``
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code (e.g. surfaced as a plain exception string). Besides the canonical "method not found", many
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JSON-RPC implementations phrase it as "Unknown method: <name>" — agentmemory's MCP server is one such
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case (#50028).
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"""
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return _jsonrpc_matches(
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exc, (_core._JSONRPC_METHOD_NOT_FOUND,),
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(str(_core._JSONRPC_METHOD_NOT_FOUND), "method not found", "unknown method", "not found: ping"))
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class InvalidMcpUrlError(ValueError):
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"""A remote MCP server's ``url`` is not parseable http(s):// — validated once at startup to fail fast.
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Validated once at startup so we fail fast with a clear message instead of burning through the
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reconnect-backoff loop on every attempt. (Ported from anomalyco/opencode#25019.)
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"""
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class NonMcpEndpointError(ConnectionError):
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"""An HTTP MCP URL served a non-MCP 2xx (e.g. ``text/html``). Non-retryable: every attempt gets
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the same page, so backoff is skipped and the server fails immediately. Subclasses ConnectionError
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so broad catches still see a connection problem."""
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# Streamable-HTTP rejection statuses an SSE-only server (or its load balancer) produces for the
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# chunked ``initialize`` POST: Bad Request, Method Not Allowed, Not Acceptable, Length Required.
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_STREAMABLE_REJECT_STATUSES = (400, 405, 406, 411)
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def _is_streamable_http_rejection(exc: BaseException) -> bool:
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"""True when a Streamable-HTTP connect failure looks like a transport mismatch rather than a
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broken server: a 400-family rejection of the initialize POST, or the SDK's opaque INTERNAL_ERROR
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(-32603 ``Server returned an error response``) it maps such rejections to on mcp >= 2.0 (error
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class per PR #104363, @RohithPariki). Timeouts and auth errors never qualify — neither carries
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these markers — so a slow or 401ing server is not retried on the wrong transport.
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"""
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root = _unwrap_exception_group(exc)
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if getattr(getattr(root, "response", None), "status_code", None) in _STREAMABLE_REJECT_STATUSES:
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return True
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code = getattr(getattr(root, "error", None), "code", None)
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return code == -32603 and "server returned an error response" in str(root).lower()
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def _unwrap_exception_group(exc: BaseException) -> BaseException:
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"""Root-cause leaf of anyio ``(Base)ExceptionGroup`` wrappers (group ``str()`` is opaque). A
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``KeyboardInterrupt``/``SystemExit`` leaf anywhere is re-raised, never flattened into a loggable
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error; a non-cancellation leaf is preferred over the ``CancelledError`` noise anyio sprays on siblings."""
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while isinstance(exc, BaseExceptionGroup) and exc.exceptions:
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leaf: BaseException = exc.split((KeyboardInterrupt, SystemExit))[0]
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if leaf is not None:
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while isinstance(leaf, BaseExceptionGroup) and leaf.exceptions:
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leaf = leaf.exceptions[0]
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raise leaf
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exc = next((sub for sub in exc.exceptions if not _contains_only_cancellation(sub)), exc.exceptions[0])
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return exc
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def _contains_only_cancellation(exc: BaseException) -> bool:
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"""True if ``exc`` is (or a group containing only) CancelledError."""
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if isinstance(exc, BaseExceptionGroup):
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return all(_contains_only_cancellation(sub) for sub in exc.exceptions)
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return isinstance(exc, asyncio.CancelledError)
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def _classify_mcp_failure(exc: BaseException) -> str:
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"""``'permanent'`` (``run()`` parks instead of burning the retry ladder: auth 401/403,
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NonMcpEndpointError, InvalidMcpUrlError, missing stdio command) or ``'transient'`` (backoff retry)."""
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root = _unwrap_exception_group(exc)
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permanent = (_is_auth_error(root)
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or isinstance(root, (NonMcpEndpointError, InvalidMcpUrlError, FileNotFoundError))
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or (isinstance(root, OSError) and getattr(root, "errno", None) == errno.ENOENT)
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# 401/403 HTTPStatusError that _is_auth_error's type-gate missed (auth types not importable here)
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or getattr(getattr(root, "response", None), "status_code", None) in (401, 403))
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return "permanent" if permanent else "transient"
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def _validate_remote_mcp_url(server_name: str, url: Any) -> str:
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"""The stripped URL if valid http(s); else InvalidMcpUrlError naming the server (non-string, other scheme —
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stdio servers use ``command`` — or empty host)."""
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def _bad(detail: str) -> InvalidMcpUrlError:
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return InvalidMcpUrlError(f"Invalid MCP URL for '{server_name}': {detail}")
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if not isinstance(url, str):
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raise _bad(f"expected a string, got {type(url).__name__}")
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stripped = url.strip()
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if not stripped:
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raise _bad("empty url")
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try:
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parsed = urlparse(stripped)
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except Exception as exc: # urlparse is very permissive — belt and braces
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raise _bad(f"{stripped!r} ({exc})") from exc
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if parsed.scheme.lower() not in {"http", "https"}:
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raise _bad(f"scheme must be http or https, got {parsed.scheme!r} ({stripped!r})")
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if not parsed.netloc:
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raise _bad(f"missing host ({stripped!r})")
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if not parsed.hostname: # ``urlparse`` accepts ``http://:8080`` (empty host, explicit port)
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raise _bad(f"missing hostname ({stripped!r})")
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return stripped
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def _resolve_client_cert(server_name: str, config: dict):
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"""``client_cert`` / ``client_key`` in httpx's ``cert=`` shape: None, a combined-PEM path,
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``(cert, key)`` or ``(cert, key, password)``. ``~`` is expanded; missing files raise a
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server-scoped FileNotFoundError instead of an opaque TLS handshake error."""
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raw_cert = config.get("client_cert")
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raw_key = config.get("client_key")
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if raw_cert is None and raw_key is None:
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return None
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prefix = f"MCP server '{server_name}': "
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def _expand(path: Any, label: str) -> str:
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if not isinstance(path, str) or not path.strip():
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raise ValueError(f"{prefix}{label} must be a non-empty string path (got {type(path).__name__})")
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expanded = os.path.expanduser(path.strip())
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if not os.path.isfile(expanded):
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raise FileNotFoundError(f"{prefix}{label} not found at {expanded!r}")
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return expanded
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if not isinstance(raw_cert, (list, tuple)):
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cert_path = _expand(raw_cert, "client_cert")
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return (cert_path, _expand(raw_key, "client_key")) if raw_key is not None else cert_path # combined PEM
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if raw_key is not None:
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raise ValueError(f"{prefix}specify either client_cert as a list [cert, key] OR client_cert + client_key, not both")
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if len(raw_cert) not in (2, 3):
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raise ValueError(f"{prefix}client_cert list form must have 2 or 3 elements (got {len(raw_cert)})")
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pair = (_expand(raw_cert[0], "client_cert[0]"), _expand(raw_cert[1], "client_cert[1]"))
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if len(raw_cert) == 2:
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return pair
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if not isinstance(raw_cert[2], str):
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raise ValueError(f"{prefix}client_cert[2] (key passphrase) must be a string")
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return (*pair, raw_cert[2])
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def _resolve_identity_header(server_name: str, config: dict):
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"""``identity_header`` ``{name, value_from: "static"|"profile", value}`` → ``(name, value)`` or
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None. Invalid configs warn and are ignored — an identity header must never break the connection.
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``profile`` resolves once at connect time."""
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raw = config.get("identity_header")
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if raw is None:
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return None
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def _ignore(detail: str, *args):
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logger.warning("MCP server '%s': identity_header " + detail + " — ignoring", server_name, *args)
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return None
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if not isinstance(raw, dict):
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return _ignore("must be a mapping with 'name' and 'value'/'value_from' keys (got %s)", type(raw).__name__)
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name = raw.get("name")
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if not isinstance(name, str) or not name.strip():
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return _ignore("requires a non-empty 'name'")
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value_from = (raw.get("value_from") or "static").strip().lower()
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if value_from == "profile":
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from hermes_cli.profiles import get_active_profile_name
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return (name.strip(), get_active_profile_name())
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if value_from != "static":
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return _ignore("value_from must be 'static' or 'profile' (got %r)", value_from)
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value = raw.get("value")
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if not isinstance(value, str) or not value.strip():
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return _ignore("with value_from: static requires a non-empty string 'value'")
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return (name.strip(), value)
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def _apply_identity_header(server_name: str, config: dict, headers: dict) -> dict:
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"""Merge the identity header into ``headers`` in place; an explicit entry of the same name (any
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casing) wins — never silently override user config."""
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name, value = _resolve_identity_header(server_name, config) or (None, None)
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if name is None:
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return headers
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if any(key.lower() == name.lower() for key in headers):
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logger.debug("MCP server '%s': identity_header '%s' already set via explicit "
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"headers config — keeping the explicit value", server_name, name)
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else:
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headers[name] = value
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return headers
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def _make_redirect_header_stripper(original_url, *, strict: bool = False,
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configured_header_names: "set[str] | frozenset[str]" = frozenset()):
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"""httpx response hook: strips ``Authorization`` when a redirect leaves the original origin;
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with *strict* (Agent Plugins v1 ``strict_redirect_headers``) every configured header (lowercase
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names in *configured_header_names*) is stripped too — v1 forbids forwarding them cross-origin."""
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origin = (original_url.scheme, original_url.host, original_url.port)
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async def _strip_on_cross_origin_redirect(response):
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target = response.next_request.url if response.is_redirect and response.next_request else None
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if target is None or (target.scheme, target.host, target.port) == origin:
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return
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headers = response.next_request.headers
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headers.pop("authorization", None)
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headers.pop("Authorization", None)
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for _name in configured_header_names if strict else ():
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while _name in headers:
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del headers[_name]
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return _strip_on_cross_origin_redirect
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# Wire-body cap, applied at the httpx transport before the SDK buffers/JSON-parses a response. A
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# hostile or misbehaving remote MCP server can stream an unbounded catalog/tool-result body and none
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# of the post-parse limits (resource cap, tool-result truncation) run before the parse blows up.
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# Finite HTTP bodies are capped at this many bytes (a larger Content-Length is rejected up front);
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# each SSE *event* is capped, with the counter reset at completed event boundaries so a long-lived
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# stream and its keepalives have no cumulative limit. Violations raise the SDK httpx's ReadError and
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# flow through the ordinary transport teardown/reconnect path (#66092).
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_MCP_HTTP_MAX_BODY_BYTES = 10 * 1024 * 1024
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_SSE_EVENT_BOUNDARIES = (b"\n\n", b"\r\n\r\n")
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def _make_mcp_body_cap_transport(httpx_mod, inner_transport, limit: int = _MCP_HTTP_MAX_BODY_BYTES):
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"""Wrap ``inner_transport`` so every response body is size-capped. ``httpx_mod`` must be the SDK's
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own httpx module (``sdk_httpx()``): the transport is handed to that SDK's ``AsyncClient``."""
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class _CappedStream(httpx_mod.AsyncByteStream):
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def __init__(self, inner, is_sse: bool, url: str):
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self._inner, self._is_sse, self._url = inner, is_sse, url
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def _reject(self, kind: str):
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return httpx_mod.ReadError(f"MCP {kind} exceeds {limit} bytes (from {self._url})")
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async def __aiter__(self):
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counted = 0
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async for chunk in self._inner:
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if self._is_sse:
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# Bytes up to the last completed event boundary belong to finished events (they must
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# still fit the per-event cap together with the carried prefix); the remainder starts
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# the next event's budget.
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boundary_end = max(chunk.rfind(sep) + len(sep) if sep in chunk else -1 for sep in _SSE_EVENT_BOUNDARIES)
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if boundary_end != -1:
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if counted + boundary_end > limit:
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raise self._reject("SSE event")
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counted = len(chunk) - boundary_end
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else:
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counted += len(chunk)
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else:
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counted += len(chunk)
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if counted > limit:
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raise self._reject("SSE event" if self._is_sse else "HTTP response")
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yield chunk
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async def aclose(self):
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await self._inner.aclose()
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class _BodyCapTransport(httpx_mod.AsyncBaseTransport):
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def __init__(self, inner):
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self._inner = inner
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async def handle_async_request(self, request):
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response = await self._inner.handle_async_request(request)
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declared = response.headers.get("content-length")
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with contextlib.suppress(ValueError): # malformed header: the streamed cap still applies
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if declared is not None and int(declared) > limit:
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await response.aclose()
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raise httpx_mod.ReadError(f"MCP HTTP response declares Content-Length {declared} > {limit} "
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f"bytes cap (from {request.url})")
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is_sse = "text/event-stream" in response.headers.get("content-type", "").lower()
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response.stream = _CappedStream(response.stream, is_sse, str(request.url))
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return response
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async def aclose(self):
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await self._inner.aclose()
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return _BodyCapTransport(inner_transport)
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def _exc_children(exc: BaseException) -> List[BaseException]:
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"""Sub-exceptions of a group, else ``__cause__``/``__context__`` when they are exceptions."""
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nested = getattr(exc, "exceptions", None)
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return list(nested) if nested else [c for c in (exc.__cause__, exc.__context__) if isinstance(c, BaseException)]
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def _format_connect_error(exc: BaseException) -> str:
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"""Render nested MCP connection errors into an actionable short message."""
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def _find_missing() -> Optional[str]:
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"""Find a missing executable without recursing through malformed chains."""
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stack = [exc]
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seen: set[int] = set()
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budget = _EXC_TRAVERSAL_MAX_NODES
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while stack and budget > 0:
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current = stack.pop()
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if id(current) in seen:
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continue
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seen.add(id(current))
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budget -= 1
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if isinstance(current, FileNotFoundError):
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if getattr(current, "filename", None):
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return str(current.filename)
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match = re.search(r"No such file or directory: '([^']+)'", str(current))
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if match:
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return match.group(1)
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# Reverse preserves the former left-to-right depth-first order.
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stack.extend(reversed(_exc_children(current)))
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return None
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def _flatten_messages() -> List[str]:
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"""Collect a short, cycle-safe rendering of an exception chain."""
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stack = [exc]
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seen: set[int] = set()
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messages: List[str] = []
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budget = _EXC_TRAVERSAL_MAX_NODES
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while stack and budget > 0:
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current = stack.pop()
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if id(current) in seen:
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continue
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seen.add(id(current))
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budget -= 1
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children = _exc_children(current)
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# A group's own str() is opaque — only its children speak.
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text = "" if getattr(current, "exceptions", None) else str(current).strip()
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if text:
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messages.append(text)
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elif not children:
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messages.append(current.__class__.__name__)
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stack.extend(reversed(children))
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return messages or [exc.__class__.__name__]
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missing = _find_missing()
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if not missing:
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return _sanitize_error("; ".join(list(dict.fromkeys(_flatten_messages()))[:3]))
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message = f"missing executable '{missing}'"
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if os.path.basename(missing) in {"npx", "npm", "node"}:
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message += (" (ensure Node.js is installed and PATH includes its bin directory, "
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"or set mcp_servers.<name>.command to an absolute path and include "
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"that directory in mcp_servers.<name>.env.PATH)")
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return _sanitize_error(message)
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def _optional_types(module: str, *names: str) -> list:
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"""``[module.name, ...]`` or ``[]`` when the module/attribute is unavailable."""
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try:
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mod = importlib.import_module(module)
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return [getattr(mod, name) for name in names]
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except (ImportError, AttributeError):
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return []
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# Lazily-built ``(auth_types, http_status_types)`` so this module imports without the SDK OAuth module.
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_AUTH_ERROR_TYPES: Optional[tuple] = None
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def _get_auth_error_types() -> tuple:
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"""Cached ``(auth_types, http_status_types)``: SDK ``OAuthFlowError``/``OAuthTokenError`` (+ legacy
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``UnauthorizedError``), our ``OAuthNonInteractiveError``, and ``HTTPStatusError`` from both httpx
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flavours — a 401 may come from the SDK's own stack (``httpx2`` on mcp >= 2.0) or Hermes' pinned
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``httpx``; the classes are unrelated and still need the 401 check in :func:`_is_auth_error`."""
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global _AUTH_ERROR_TYPES
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if not (_AUTH_ERROR_TYPES and _AUTH_ERROR_TYPES[0]): # retry while empty (SDK may import later)
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sdk_mod = _core.sdk_httpx()
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http_types = tuple(dict.fromkeys(
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([sdk_mod.HTTPStatusError] if sdk_mod is not None else []) + _optional_types("httpx", "HTTPStatusError")))
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auth_types = (*_optional_types("mcp.client.auth", "OAuthFlowError", "OAuthTokenError"),
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*_optional_types("mcp.client.auth", "UnauthorizedError"), # older SDKs
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*_optional_types("tools.mcp_oauth", "OAuthNonInteractiveError"), *http_types)
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_AUTH_ERROR_TYPES = (auth_types, http_types)
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return _AUTH_ERROR_TYPES
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def _is_auth_error(exc: BaseException) -> bool:
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"""True if ``exc`` indicates an MCP OAuth failure; ``HTTPStatusError`` counts only with status 401."""
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auth_types, http_types = _get_auth_error_types()
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if not isinstance(exc, auth_types):
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return False
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return getattr(exc.response, "status_code", None) == 401 if isinstance(exc, http_types) else True
|
|
|
|
|
|
# Lower-cased substrings meaning the transport session expired / was GC'd (OAuth token still valid).
|
|
# Substrings (lower-cased match) that indicate the MCP server rejected the request because its server-side
|
|
# transport session expired / was garbage-collected. See #13383.
|
|
_SESSION_EXPIRED_MARKERS: tuple = (
|
|
"invalid or expired session", "expired session", "session expired", "session not found",
|
|
"unknown session", "session terminated", "closedresourceerror", "closed resource",
|
|
"transport is closed", "connection closed", "broken pipe", "end of file")
|
|
|
|
# Node budget for ``_is_session_expired_error`` (the visited set breaks cycles; this bounds acyclic blow-ups).
|
|
# Well above ``sys.getrecursionlimit()`` so deep task-group nesting is fully scanned.
|
|
_EXC_TRAVERSAL_MAX_NODES = 10_000
|
|
|
|
|
|
def _is_session_expired_error(exc: BaseException) -> bool:
|
|
"""True if ``exc`` looks like a transport session expiry (Streamable-HTTP servers GC session state on idle TTL /
|
|
restart / pod rotation while the OAuth token stays valid) — the fix is a transport reconnect, not an OAuth
|
|
refresh. Iterative walk over ``exceptions`` / ``__cause__`` / ``__context__`` with a visited set AND a node
|
|
budget; every reachable node is inspected so an InterruptedError anywhere overrides transport markers, and the
|
|
chain walk matters because SDK wrappers raise a generic RuntimeError *from* a message-less ClosedResourceError."""
|
|
# AnyIO stream exceptions are often message-less, so type checks complement marker matching.
|
|
transport_error_types = tuple(_optional_types("anyio", "BrokenResourceError", "ClosedResourceError", "EndOfStream"))
|
|
stack: "list[BaseException | None]" = [exc]
|
|
seen: set[int] = set()
|
|
found = False
|
|
budget = _EXC_TRAVERSAL_MAX_NODES
|
|
while stack and budget > 0:
|
|
current = stack.pop()
|
|
if current is None or id(current) in seen:
|
|
continue
|
|
seen.add(id(current))
|
|
budget -= 1
|
|
if isinstance(current, InterruptedError):
|
|
return False
|
|
# Messages vary across SDK versions/servers: a narrow allow-list of stable substrings avoids false positives.
|
|
msg = str(current).lower()
|
|
found = found or isinstance(current, transport_error_types) or any(m in msg for m in _SESSION_EXPIRED_MARKERS)
|
|
stack.extend((*getattr(current, "exceptions", ()), getattr(current, "__cause__", None),
|
|
getattr(current, "__context__", None)))
|
|
return found
|