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agent.py
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249
agent.py
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import json
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import math
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import os
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from dotenv import load_dotenv
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from openai import AsyncOpenAI
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from pydantic_ai import Agent
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from pydantic_ai.mcp import MCPServerHTTP, MCPServerSSE, MCPServerStreamableHTTP
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from pydantic_ai.models.openai import OpenAIModel
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from pydantic_ai.providers.openai import OpenAIProvider
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from schemas import RoutePlanRequest, RoutePlanResult
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load_dotenv()
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class ConfigurationError(RuntimeError):
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pass
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class GuardrailError(RuntimeError):
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pass
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def _required_env(name: str) -> str:
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value = os.getenv(name, "").strip()
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if not value:
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raise ConfigurationError(f"Missing required environment variable: {name}")
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return value
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def _env_positive_int(name: str, default: int) -> int:
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raw_value = os.getenv(name, str(default)).strip()
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try:
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parsed = int(raw_value)
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except ValueError as exc:
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raise ConfigurationError(f"Environment variable {name} must be an integer") from exc
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if parsed <= 0:
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raise ConfigurationError(f"Environment variable {name} must be greater than 0")
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return parsed
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def _env_positive_float(name: str, default: float) -> float:
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raw_value = os.getenv(name, str(default)).strip()
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try:
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parsed = float(raw_value)
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except ValueError as exc:
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raise ConfigurationError(f"Environment variable {name} must be a number") from exc
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if parsed <= 0:
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raise ConfigurationError(f"Environment variable {name} must be greater than 0")
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return parsed
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def _build_model() -> OpenAIModel:
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openai_client = AsyncOpenAI(
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base_url=_required_env("ARK_BASE_URL"),
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api_key=_required_env("ARK_API_KEY"),
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timeout=_env_positive_float("ARK_REQUEST_TIMEOUT_SECONDS", 120.0),
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)
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provider = OpenAIProvider(
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openai_client=openai_client,
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)
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return OpenAIModel(
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_required_env("ARK_MODEL"),
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provider=provider,
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)
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def _build_mcp_headers() -> dict[str, str] | None:
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header_name = os.getenv("AMAP_MCP_AUTH_HEADER_NAME", "").strip()
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header_value = os.getenv("AMAP_MCP_AUTH_HEADER_VALUE", "").strip()
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if header_name and header_value:
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return {header_name: header_value}
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if header_name or header_value:
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raise ConfigurationError(
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"AMAP_MCP_AUTH_HEADER_NAME and AMAP_MCP_AUTH_HEADER_VALUE must be set together"
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)
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return None
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def _build_mcp_server() -> MCPServerHTTP | MCPServerSSE | MCPServerStreamableHTTP:
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transport = os.getenv("AMAP_MCP_TRANSPORT", "streamable_http").strip().lower()
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url = _required_env("AMAP_MCP_URL")
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headers = _build_mcp_headers()
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timeout = _env_positive_float("AMAP_MCP_TIMEOUT_SECONDS", 20.0)
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read_timeout = _env_positive_float("AMAP_MCP_READ_TIMEOUT_SECONDS", 60.0)
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if transport == "sse":
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return MCPServerSSE(url=url, headers=headers, timeout=timeout, read_timeout=read_timeout)
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if transport == "http":
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return MCPServerHTTP(url=url, headers=headers, timeout=timeout, read_timeout=read_timeout)
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if transport == "streamable_http":
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return MCPServerStreamableHTTP(
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url=url,
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headers=headers,
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timeout=timeout,
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read_timeout=read_timeout,
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)
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raise ConfigurationError(
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"AMAP_MCP_TRANSPORT must be one of: streamable_http, http, sse"
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)
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# ---------------------------------------------------------------------------
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# Agent
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# ---------------------------------------------------------------------------
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SYSTEM_PROMPT = """\
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你是一个无状态的多目标地理路线规划 Agent。你的任务是使用高德地图 MCP 工具完成多目标点最优路线规划，并返回强类型结构化结果。\
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你必须显式调用地图工具，不得编造坐标、POI、距离、时长或 deep link。
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你的工作流必须严格遵守以下规则：
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1. 先解析输入，明确起点模式、终点、途经点、优化策略和输出需求。
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2. 对终点和每个途经点优先使用 maps_geo 解析地址；当命中不准或为空时，使用 maps_text_search 补齐 POI；必要时使用 maps_search_detail 校验。
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3. 当起点模式为 fixed 时，对起点也做同样解析。
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4. 当起点模式为 current_location 时，不得伪造起点坐标；如果缺少实时定位坐标，只能比较途经点内部顺序，并明确说明真实最优路线会受当前定位影响。
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5. 这套工具没有单步多点最优路径工具，因此你必须自己生成候选途经点顺序。
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6. 对每个候选顺序，逐段调用 maps_direction_driving 计算距离与时长，并汇总为候选路线。
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7. 按 route_strategy 选择最优路线：
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- shortest_distance：总里程优先，总时长次优
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- fastest_time：总时长优先，总里程次优
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- balanced：优先选择明显不劣的 Pareto 优势路线；若出现里程更短但时间略长的情况，默认优先里程更短并说明原因
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8. 如需 deep link：
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- 若目标是稳定导入整组点位，可使用 maps_schema_personal_map，但必须说明这是点位导入型链接
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- 若目标是"我的位置"出发的即时导航，应输出 route plan 类 deep link，并说明不同平台协议不同
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9. 最终结果必须包含：resolved_origin（如适用）、resolved_destination、resolved_stops、candidates、best_route、deep_links、summary、warnings。
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10. 如果任何地址无法可靠解析、任何 POI 无法获取、或任何路线比较存在信息缺失，必须如实说明，不得猜测。
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11. 你的输入会以 RoutePlanRequest JSON 形式提供。你必须基于该 JSON 进行规划，不能擅自补造字段。
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12. 在返回结果前，必须确认 best_route 来自 candidates 之一，且每一段 distance 和 duration 都来自工具调用。
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你的底层返回必须是结构化数据，不是 HTML。只有在用户明确要求页面展示时，才在结构化结果基础上额外生成 HTML。
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"""
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def _configured_max_permutations() -> int:
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return _env_positive_int("ROUTE_MAX_PERMUTATIONS", 20)
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def _candidate_count(stop_count: int) -> int:
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return math.factorial(stop_count)
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def _prepare_request(request: RoutePlanRequest) -> RoutePlanRequest:
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configured_limit = _configured_max_permutations()
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effective_limit = request.max_permutations or configured_limit
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if effective_limit > configured_limit:
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raise GuardrailError(
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"Requested max_permutations exceeds the configured service limit: "
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f"requested={effective_limit}, configured={configured_limit}"
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)
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candidate_count = _candidate_count(len(request.stops))
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if candidate_count > effective_limit:
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raise GuardrailError(
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"Candidate permutations exceed the configured limit: "
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f"stops={len(request.stops)}, permutations={candidate_count}, limit={effective_limit}"
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)
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return request.model_copy(update={"max_permutations": effective_limit})
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def _build_user_prompt(request: RoutePlanRequest) -> str:
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request_json = json.dumps(request.model_dump(mode="json"), ensure_ascii=False, indent=2)
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return (
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"请根据下面的 RoutePlanRequest JSON 执行多目标路线规划。\n"
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"必须显式使用高德 MCP 工具完成地址解析、逐段驾车路线计算和 deep link 生成。\n"
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"如果输入中存在固定起点，则完整路线必须从起点开始；如果起点模式是 current_location，"
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"则不得伪造起点坐标。\n"
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f"本次运行的候选顺序硬上限是 {request.max_permutations}。\n\n"
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"RoutePlanRequest JSON:\n"
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f"{request_json}"
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)
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def _same_candidate(left_candidate, right_candidate) -> bool:
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return (
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left_candidate.full_order_labels == right_candidate.full_order_labels
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and left_candidate.total_distance_m == right_candidate.total_distance_m
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and left_candidate.total_duration_s == right_candidate.total_duration_s
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and len(left_candidate.legs) == len(right_candidate.legs)
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)
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def _validate_result(request: RoutePlanRequest, result: RoutePlanResult) -> RoutePlanResult:
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if result.origin_mode != request.origin_mode:
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raise GuardrailError("Agent output origin_mode does not match the request")
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if result.resolved_destination.role != "destination":
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raise GuardrailError("resolved_destination.role must be 'destination'")
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if len(result.resolved_stops) != len(request.stops):
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raise GuardrailError("resolved_stops count does not match the request")
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if any(stop.role != "stop" for stop in result.resolved_stops):
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raise GuardrailError("All resolved_stops entries must have role='stop'")
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if request.origin_mode == "fixed":
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if result.resolved_origin is None:
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raise GuardrailError("resolved_origin is required when origin_mode='fixed'")
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if result.resolved_origin.role != "origin":
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raise GuardrailError("resolved_origin.role must be 'origin'")
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else:
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if result.resolved_origin is not None:
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raise GuardrailError("resolved_origin must be null when origin_mode='current_location'")
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if result.success:
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if not result.candidates:
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raise GuardrailError("A successful result must include at least one candidate route")
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if len(result.candidates) > (request.max_permutations or 0):
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raise GuardrailError("Agent returned more candidates than allowed by max_permutations")
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matching_candidate = next(
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(
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candidate
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for candidate in result.candidates
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if _same_candidate(candidate, result.best_route)
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),
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None,
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)
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if matching_candidate is None:
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raise GuardrailError("best_route must be one of the candidates")
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return result
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def create_geo_agent() -> Agent[None, RoutePlanResult]:
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return Agent(
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model=_build_model(),
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toolsets=[_build_mcp_server()],
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output_type=RoutePlanResult,
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system_prompt=SYSTEM_PROMPT,
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)
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# ---------------------------------------------------------------------------
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# Public entry point
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# ---------------------------------------------------------------------------
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async def run_route_plan(request: RoutePlanRequest) -> RoutePlanResult:
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"""Execute the route planning agent for a given request."""
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prepared_request = _prepare_request(request)
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agent = create_geo_agent()
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async with agent:
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result = await agent.run(_build_user_prompt(prepared_request))
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return _validate_result(prepared_request, result.output)
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