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refactor: standardize resource response format

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Introduce ReadResourceContents type to properly handle MIME types in resource responses. Breaking change in FastMCP read_resource() return type.

Github-Issue:#152
This commit is contained in:
David Soria Parra 2025-01-27 20:36:10 +00:00
commit 070e8412c0
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1 changed files with 155 additions and 35 deletions
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7
tests/issues/test_152_resource_mime_type.py
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@ -6,6 +6,7 @@ from pydantic import AnyUrl
from mcp import types
from mcp.server.fastmcp import FastMCP
from mcp.server.lowlevel import Server
from mcp.server.lowlevel.helper_types import ReadResourceContents
from mcp.shared.memory import (
create_connected_server_and_client_session as client_session,
)
@ -98,9 +99,11 @@ async def test_lowlevel_resource_mime_type():
@server.read_resource()
async def handle_read_resource(uri: AnyUrl):
if str(uri) == "test://image":
return (base64_string, "image/png")
return ReadResourceContents(content=base64_string, mime_type="image/png")
elif str(uri) == "test://image_bytes":
return (bytes(image_bytes), "image/png")
return ReadResourceContents(
content=bytes(image_bytes), mime_type="image/png"
)
raise Exception(f"Resource not found: {uri}")
# Test that resources are listed with correct mime type