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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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18
tests/interaction/mcpserver/test_resources.py
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@ -112,10 +112,7 @@ async def test_read_templated_resource(connect: Connect) -> None:
@requirement("mcpserver:resource:unknown-uri")
async def test_read_unknown_uri_is_error(connect: Connect) -> None:
"""Reading a URI that matches no registered resource fails with a JSON-RPC error.
The spec reserves -32002 for resource-not-found; see the divergence note on the requirement.
"""
"""Reading a URI that matches no registered resource fails with -32602 and the URI in data (SEP-2164)."""
mcp = MCPServer("library")
@mcp.resource("config://app")
@ -127,16 +124,17 @@ async def test_read_unknown_uri_is_error(connect: Connect) -> None:
with pytest.raises(MCPError) as exc_info:
await client.read_resource("config://missing")
assert exc_info.value.error == snapshot(ErrorData(code=0, message="Unknown resource: config://missing"))
assert exc_info.value.error == snapshot(
ErrorData(code=-32602, message="Unknown resource: config://missing", data={"uri": "config://missing"})
)
@requirement("mcpserver:resource:read-throws-surfaced")
async def test_resource_function_that_raises_is_surfaced_as_a_jsonrpc_error(connect: Connect) -> None:
"""An exception raised by a resource function reaches the caller as a JSON-RPC error.
MCPServer wraps the failure in a generic error that names only the URI, so the original
exception text is not leaked to the client. The wrapped exception becomes error code 0 the
same way every other unhandled server-side exception does.
MCPServer wraps the failure in a generic ResourceError that names only the URI, so the original
exception text is not leaked to the client. The wrapped exception surfaces as -32603 Internal error.
"""
mcp = MCPServer("library")
@ -148,7 +146,9 @@ async def test_resource_function_that_raises_is_surfaced_as_a_jsonrpc_error(conn
with pytest.raises(MCPError) as exc_info:
await client.read_resource("res://boom")
assert exc_info.value.error == snapshot(ErrorData(code=0, message="Error reading resource res://boom"))
assert exc_info.value.error == snapshot(
ErrorData(code=-32603, message="Error reading resource res://boom", data={"uri": "res://boom"})
)
@requirement("mcpserver:resource:duplicate-name")