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Return -32602 for resource not found (SEP-2164) (#2920)

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Marcelo Trylesinski 2026-06-20 15:55:23 +01:00 • committed by GitHub
commit f253682393
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1 changed files with 113 additions and 43 deletions
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23
src/mcp/server/mcpserver/server.py
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@ -31,7 +31,7 @@ from mcp.server.lowlevel.helper_types import ReadResourceContents
from mcp.server.lowlevel.server import LifespanResultT, Server
from mcp.server.lowlevel.server import lifespan as default_lifespan
from mcp.server.mcpserver.context import Context
from mcp.server.mcpserver.exceptions import ResourceError
from mcp.server.mcpserver.exceptions import ResourceError, ResourceNotFoundError
from mcp.server.mcpserver.prompts import Prompt, PromptManager
from mcp.server.mcpserver.resources import FunctionResource, Resource, ResourceManager
from mcp.server.mcpserver.tools import Tool, ToolManager
@ -44,6 +44,8 @@ from mcp.server.streamable_http_manager import StreamableHTTPSessionManager
from mcp.server.transport_security import TransportSecuritySettings
from mcp.shared.exceptions import MCPError
from mcp.types import (
INTERNAL_ERROR,
INVALID_PARAMS,
Annotations,
BlobResourceContents,
CallToolRequestParams,
@ -341,7 +343,12 @@ class MCPServer(Generic[LifespanResultT]):
self, ctx: ServerRequestContext[LifespanResultT], params: ReadResourceRequestParams
) -> ReadResourceResult:
context = Context(request_context=ctx, mcp_server=self)
results = await self.read_resource(params.uri, context)
try:
results = await self.read_resource(params.uri, context)
except ResourceNotFoundError as err:
raise MCPError(code=INVALID_PARAMS, message=str(err), data={"uri": str(params.uri)})
except ResourceError as err:
raise MCPError(code=INTERNAL_ERROR, message=str(err), data={"uri": str(params.uri)})
contents: list[TextResourceContents | BlobResourceContents] = []
for item in results:
if isinstance(item.content, bytes):
@ -442,13 +449,15 @@ class MCPServer(Generic[LifespanResultT]):
async def read_resource(
self, uri: AnyUrl | str, context: Context[LifespanResultT, Any] | None = None
) -> Iterable[ReadResourceContents]:
"""Read a resource by URI."""
"""Read a resource by URI.
Raises:
ResourceNotFoundError: If no resource or template matches the URI.
ResourceError: If template creation or resource reading fails.
"""
if context is None:
context = Context(mcp_server=self)
try:
resource = await self._resource_manager.get_resource(uri, context)
except ValueError as exc:
raise ResourceError(f"Unknown resource: {uri}") from exc
resource = await self._resource_manager.get_resource(uri, context)
try:
content = await resource.read()