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fix(tools): do not index tools, only index toolgroups (#2261)

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When registering a MCP endpoint, we cannot list tools (like we used to)
since the MCP endpoint may be behind an auth wall. Registration can
happen much sooner (via run.yaml).

Instead, we do listing only when the _user_ actually calls listing.
Furthermore, we cache the list in-memory in the server. Currently, the
cache is not invalidated -- we may want to periodically re-list for MCP
servers. Note that they must call `list_tools` before calling
`invoke_tool` -- we use this critically.

This will enable us to list MCP servers in run.yaml

## Test Plan

Existing tests, updated tests accordingly.
This commit is contained in:
Ashwin Bharambe 2025-05-25 13:27:52 -07:00 • committed by GitHub
parent 5a422e236c
commit ce33d02443
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19 changed files with 131 additions and 153 deletions
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11
llama_stack/providers/remote/tool_runtime/model_context_protocol/model_context_protocol.py
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@ -11,12 +11,13 @@ from llama_stack.apis.common.content_types import URL
from llama_stack.apis.datatypes import Api
from llama_stack.apis.tools import (
ListToolDefsResponse,
ToolGroup,
ToolInvocationResult,
ToolRuntime,
)
from llama_stack.distribution.request_headers import NeedsRequestProviderData
from llama_stack.log import get_logger
from llama_stack.providers.datatypes import ToolsProtocolPrivate
from llama_stack.providers.datatypes import ToolGroupsProtocolPrivate
from llama_stack.providers.utils.tools.mcp import convert_header_list_to_dict, invoke_mcp_tool, list_mcp_tools
from .config import MCPProviderConfig
@ -24,13 +25,19 @@ from .config import MCPProviderConfig
logger = get_logger(__name__, category="tools")
class ModelContextProtocolToolRuntimeImpl(ToolsProtocolPrivate, ToolRuntime, NeedsRequestProviderData):
class ModelContextProtocolToolRuntimeImpl(ToolGroupsProtocolPrivate, ToolRuntime, NeedsRequestProviderData):
def __init__(self, config: MCPProviderConfig, _deps: dict[Api, Any]):
self.config = config
async def initialize(self):
pass
async def register_toolgroup(self, toolgroup: ToolGroup) -> None:
pass
async def unregister_toolgroup(self, toolgroup_id: str) -> None:
return
async def list_runtime_tools(
self, tool_group_id: str | None = None, mcp_endpoint: URL | None = None
) -> ListToolDefsResponse: