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37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
"""LangChain adapter (EPIC 12.6).
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Exposes lean-ctx tools as LangChain `Tool`s. The framework is an optional
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dependency, imported lazily so the SDK has no hard coupling.
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"""
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from __future__ import annotations
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from typing import Any, List
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from ..client import LeanCtxClient
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from ._common import make_json_runner, normalized_tool_specs
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def to_langchain_tools(client: LeanCtxClient) -> List[Any]:
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"""Return lean-ctx tools as `langchain_core.tools.Tool` instances.
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Each tool accepts a JSON object string of arguments — the most portable
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shape across LangChain versions.
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"""
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try:
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from langchain_core.tools import Tool
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except ImportError as exc: # pragma: no cover - exercised only without dep
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raise ImportError(
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"LangChain is required for this adapter: pip install langchain-core"
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) from exc
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tools: List[Any] = []
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for spec in normalized_tool_specs(client):
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runner = make_json_runner(client, spec.name)
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description = (
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f"{spec.description} "
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"Input: a JSON object string matching this tool's argument schema."
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).strip()
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tools.append(Tool(name=spec.name, description=description, func=runner))
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return tools
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