aljaz/mcp-python-sdk
1
0
Fork 0
mirror of https://github.com/aljazceru/mcp-python-sdk.git synced 2025-12-19 14:54:24 +01:00
Code Issues Packages Projects Releases Wiki Activity

Fix #177: Returning multiple tool results (#222)

Browse Source 
* feat: allow lowlevel servers to return a list of resources

The resource/read message in MCP allows of multiple resources
to be returned. However, in the SDK we do not allow this. This
change is such that we allow returning multiple resource in
the lowlevel API if needed. However in FastMCP we stick to
one, since a FastMCP resource defines the mime_type in the decorator
and hence a resource cannot dynamically return different mime_typed resources.
It also is just the better default to only return one resource.
However in the lowlevel API we will allow this.

Strictly speaking this is not a BC break since the new return value
is additive, but if people subclassed server, it will break them.

* feat: lower the type requriements for call_tool to Iterable
This commit is contained in:
David Soria Parra
2025-02-20 21:31:26 +00:00
committed by GitHub
parent 2628e01f4b
commit b1942b31c4
7 changed files with 62 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
tests/server/fastmcp/servers/test_file_server.py
View File

@@ -88,7 +88,10 @@ async def test_list_resources(mcp: FastMCP):
@pytest.mark.anyio
async def test_read_resource_dir(mcp: FastMCP):
res = await mcp.read_resource("dir://test_dir")
res_iter = await mcp.read_resource("dir://test_dir")
res_list = list(res_iter)
assert len(res_list) == 1
res = res_list[0]
assert res.mime_type == "text/plain"
files = json.loads(res.content)
@@ -102,7 +105,10 @@ async def test_read_resource_dir(mcp: FastMCP):
@pytest.mark.anyio
async def test_read_resource_file(mcp: FastMCP):
res = await mcp.read_resource("file://test_dir/example.py")
res_iter = await mcp.read_resource("file://test_dir/example.py")
res_list = list(res_iter)
assert len(res_list) == 1
res = res_list[0]
assert res.content == "print('hello world')"
@@ -119,5 +125,8 @@ async def test_delete_file_and_check_resources(mcp: FastMCP, test_dir: Path):
await mcp.call_tool(
"delete_file", arguments=dict(path=str(test_dir / "example.py"))
)
res = await mcp.read_resource("file://test_dir/example.py")
res_iter = await mcp.read_resource("file://test_dir/example.py")
res_list = list(res_iter)
assert len(res_list) == 1
res = res_list[0]
assert res.content == "File not found"