From f8d98b63a7e9ab5855d79556d3d7e5638472af6c Mon Sep 17 00:00:00 2001 From: BabyChrist666 Date: Mon, 2 Mar 2026 07:56:24 -0500 Subject: [PATCH] Backport: Add missing TasksCallCapability to v1.x (#2137) Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com> Co-authored-by: Claude --- src/mcp/server/lowlevel/experimental.py | 3 ++- tests/experimental/tasks/server/test_run_task_flow.py | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/src/mcp/server/lowlevel/experimental.py b/src/mcp/server/lowlevel/experimental.py index 0e6655b3..42353e4e 100644 --- a/src/mcp/server/lowlevel/experimental.py +++ b/src/mcp/server/lowlevel/experimental.py @@ -31,6 +31,7 @@ from mcp.types import ( ServerResult, ServerTasksCapability, ServerTasksRequestsCapability, + TasksCallCapability, TasksCancelCapability, TasksListCapability, TasksToolsCapability, @@ -79,7 +80,7 @@ class ExperimentalHandlers: capabilities.tasks.cancel = TasksCancelCapability() capabilities.tasks.requests = ServerTasksRequestsCapability( - tools=TasksToolsCapability() + tools=TasksToolsCapability(call=TasksCallCapability()) ) # assuming always supported for now def enable_tasks( diff --git a/tests/experimental/tasks/server/test_run_task_flow.py b/tests/experimental/tasks/server/test_run_task_flow.py index 7f680beb..9e21746e 100644 --- a/tests/experimental/tasks/server/test_run_task_flow.py +++ b/tests/experimental/tasks/server/test_run_task_flow.py @@ -227,6 +227,10 @@ async def test_enable_tasks_auto_registers_handlers() -> None: assert caps_after.tasks is not None assert caps_after.tasks.list is not None assert caps_after.tasks.cancel is not None + # Verify nested call capability is present + assert caps_after.tasks.requests is not None + assert caps_after.tasks.requests.tools is not None + assert caps_after.tasks.requests.tools.call is not None @pytest.mark.anyio