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feat(mcp): allow MCP Server --tool_name filter to reference function groups #1093

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Merged
merged 2 commits into from
Oct 23, 2025
Merged

feat(mcp): allow MCP Server --tool_name filter to reference function groups #1093

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049906f
fix: allow MCP Server `--tool_name` filter to reference function grou…
willkill07 Oct 23, 2025
8162955
update config description
willkill07 Oct 23, 2025
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7 changes: 5 additions & 2 deletions src/nat/front_ends/mcp/mcp_front_end_config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,11 @@ class MCPFrontEndConfig(FrontEndBaseConfig, name="mcp"):
port: int = Field(default=9901, description="Port to bind the server to (default: 9901)", ge=0, le=65535)
debug: bool = Field(default=False, description="Enable debug mode (default: False)")
log_level: str = Field(default="INFO", description="Log level for the MCP server (default: INFO)")
tool_names: list[str] = Field(default_factory=list,
description="The list of tools MCP server will expose (default: all tools)")
tool_names: list[str] = Field(
default_factory=list,
description="The list of tools MCP server will expose (default: all tools)."
"Tool names can be functions or function groups",
)
transport: Literal["sse", "streamable-http"] = Field(
default="streamable-http",
description="Transport type for the MCP server (default: streamable-http, backwards compatible with sse)")
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4 changes: 4 additions & 0 deletions src/nat/front_ends/mcp/mcp_front_end_plugin_worker.py
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Expand Up @@ -234,6 +234,10 @@ async def add_routes(self, mcp: FastMCP, builder: WorkflowBuilder):
filtered_functions: dict[str, Function] = {}
for function_name, function in functions.items():
if function_name in self.front_end_config.tool_names:
# Treat current tool_names as function names, so check if the function name is in the list
filtered_functions[function_name] = function
elif any(function_name.startswith(f"{group_name}.") for group_name in self.front_end_config.tool_names):
# Treat tool_names as function group names, so check if the function name starts with the group name
filtered_functions[function_name] = function
else:
logger.debug("Skipping function %s as it's not in tool_names", function_name)
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