Import PoC4 MCP test UI source snapshot
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devmrko
190
poc4_active_source_20260714/src/mcp_tool_router.py
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190
poc4_active_source_20260714/src/mcp_tool_router.py
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"""LLM-based MCP tool routing.
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The router receives only the user question and the discovered MCP tool
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descriptors. It never receives MCP bearer tokens or provider credentials.
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"""
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from __future__ import annotations
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from dataclasses import dataclass
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import json
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from typing import Any, Mapping
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from src.oci_genai_sdk import (
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build_oci_genai_completion_client,
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temperature_for_model_profile,
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)
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from src.poc3.model_registry import resolve_model_profile
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@dataclass(frozen=True)
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class McpTool:
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name: str
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description: str
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schema: Mapping[str, Any]
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read_only: bool
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@dataclass(frozen=True)
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class RoutedMcpTool:
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server_id: str
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tool: McpTool
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class McpToolRouterError(RuntimeError):
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"""Safe routing error. Must not contain secrets or provider traces."""
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def route_mcp_tool_across_servers_with_llm(
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tools: list[RoutedMcpTool],
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question: str,
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*,
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router_model_profile: str,
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) -> RoutedMcpTool:
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"""Select one discovered MCP server/tool pair with OCI GenAI."""
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candidates = list(tools)
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if not candidates:
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raise McpToolRouterError("라우팅 가능한 MCP tool이 없습니다.")
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by_key = {
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"{}::{}".format(candidate.server_id, candidate.tool.name): candidate
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for candidate in candidates
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}
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route_keys = list(by_key)
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try:
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profile = resolve_model_profile(router_model_profile)
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client = build_oci_genai_completion_client(
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profile.model_id,
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profile.answer_model_region,
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profile.answer_model_endpoint,
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)
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tool_catalog = [
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{
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"route_key": "{}::{}".format(candidate.server_id, candidate.tool.name),
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"server_id": candidate.server_id,
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"tool_name": candidate.tool.name,
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"description": candidate.tool.description[:1000],
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"input_properties": sorted(
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(
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candidate.tool.schema.get("properties", {})
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if isinstance(
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candidate.tool.schema.get("properties"), Mapping
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)
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else {}
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).keys()
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),
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"read_only": candidate.tool.read_only,
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}
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for candidate in candidates
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]
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text = client.complete(
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system_prompt=(
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"You are an MCP server and tool router. Choose exactly one "
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"server/tool route for the user question from the discovered "
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"routes. Return only JSON that matches the schema. Never "
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"request or expose bearer tokens. Do not invent server ids or "
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"tool names."
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),
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user_prompt=json.dumps(
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{
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"question": question,
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"routes": tool_catalog,
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},
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ensure_ascii=False,
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),
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response_schema={
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"type": "object",
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"additionalProperties": False,
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"required": ["route_key"],
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"properties": {
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"route_key": {
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"type": "string",
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"enum": route_keys,
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}
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},
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},
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max_tokens=256,
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temperature=temperature_for_model_profile(profile),
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)
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routed = json.loads(text)
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except Exception:
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raise McpToolRouterError("LLM tool router 호출에 실패했습니다.") from None
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if not isinstance(routed, Mapping):
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raise McpToolRouterError("LLM tool router 응답 형식이 올바르지 않습니다.")
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selected_key = str(routed.get("route_key") or "").strip()
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selected = by_key.get(selected_key)
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if selected is None:
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raise McpToolRouterError("LLM tool router가 허용되지 않은 route를 선택했습니다.")
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return selected
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def route_mcp_tool_with_llm(
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tools: list[McpTool],
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question: str,
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*,
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preferred_tool: str,
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tool_allowlist: tuple[str, ...],
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router_model_profile: str,
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) -> McpTool:
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"""Backward-compatible single-server routing helper."""
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candidates = [
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tool for tool in tools if not tool_allowlist or tool.name in tool_allowlist
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]
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routed = route_mcp_tool_across_servers_with_llm(
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[RoutedMcpTool(server_id="default", tool=tool) for tool in candidates],
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question,
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router_model_profile=router_model_profile,
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)
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return routed.tool
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def build_mcp_tool_arguments(
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tool: McpTool,
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question: str,
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limit: int,
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*,
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preferred_tool: str,
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) -> dict[str, Any]:
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"""Build bounded tool arguments from the selected tool schema."""
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properties = tool.schema.get("properties")
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if not isinstance(properties, Mapping):
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properties = {}
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if tool.name == preferred_tool:
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return {"prompt": question, "limit": limit}
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if "prompt" in properties:
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args: dict[str, Any] = {"prompt": question}
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if "limit" in properties:
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args["limit"] = limit
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elif "max_rows" in properties:
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args["max_rows"] = limit
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return args
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if "question" in properties:
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args = {"question": question}
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if "max_rows" in properties:
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args["max_rows"] = limit
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elif "limit" in properties:
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args["limit"] = limit
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return args
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if "query" in properties:
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args = {"query": question}
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if "max_evidence" in properties:
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args["max_evidence"] = min(limit, 10)
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elif "limit" in properties:
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args["limit"] = limit
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return args
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return {"prompt": question, "limit": limit}
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__all__ = [
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"McpTool",
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"McpToolRouterError",
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"RoutedMcpTool",
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"build_mcp_tool_arguments",
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"route_mcp_tool_across_servers_with_llm",
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"route_mcp_tool_with_llm",
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]
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