{"$schema":"https://wellknown.network/schemas/agent-record-v1.json","schemaVersion":"1","id":"ag_dndtb9gxv9hg","handle":"langchain-to-mcp-tool-adapter","url":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter","links":{"self":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter/record.json","html":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter","markdown":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter/record.md","api":"https://wellknown.network/api/v1/agents/langchain-to-mcp-tool-adapter","status":"https://wellknown.network/api/v1/agents/langchain-to-mcp-tool-adapter/status","claim":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter/claim","claimApi":"https://wellknown.network/api/v1/claims","claimDescriptor":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter/claim.json","badge":"https://wellknown.network/agents/langchain-to-mcp-tool-adapter/badge.svg","openapi":"https://wellknown.network/openapi.json","history":"https://wellknown.network/api/v1/agents/langchain-to-mcp-tool-adapter/history","tools":"https://wellknown.network/api/v1/agents/langchain-to-mcp-tool-adapter/tools"},"ard":{"identifier":"urn:air::server:langchain-to-mcp-tool-adapter","type":"application/mcp-server-card+json"},"kind":"mcp_server","declared":{"name":"langchain-to-mcp-tool-adapter","summary":"Adapter for converting LangChain tools to FastMCP tools","description":"# LangChain to MCP Tool Adapter\n\n[![PyPI version](https://badge.fury.io/py/langchain-to-mcp-tool-adapter.svg)](https://badge.fury.io/py/langchain-to-mcp-tool-adapter)\n[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)\n\nA Python package for converting LangChain tools to FastMCP tools, making it easy to use your existing LangChain tools with Anthropic's MCP server.\n\n## Why Use This Package?\n\n- **Simpler Implementation**: While LangChain offers an MCP-to-LangChain adapter, it requires a running MCP server either remotely or co-located with an agent, which can be finicky. LangChain tools have a simpler implementation and are more lightweight.\n- **Use in Multiple Environments**: When creating tools (especially for open source), you might want to make them available in both LangChain and MCP implementations without duplicating code.\n- **Handle Artifacts Properly**: Automatic conversion between LangChain's `content_and_artifact` format and MCP's content format for images, PDFs, and other binary data.\n- **Preserve Metadata**: Tool descriptions, argument schemas, and other metadata are preserved during conversion.\n\n## Installation\n\n```bash\npip install langchain-to-mcp-tool-adapter\n```\n\n## Quick Start\n\n```python\nfrom mcp.server import FastMCP\nfrom langchain.tools import Tool\nfrom langchain_to_mcp_tool_adapter import add_langchain_tool_to_server\n\n# Create a LangChain tool\ndef multiply(a: int, b: int) -> int:\n    \"\"\"Multiply two numbers.\"\"\"\n    return a * b\n\ncalculator_tool = Tool(\n    name=\"calculator\",\n    description=\"Multiply two numbers together\",\n    func=multiply\n)\n\n# Create a FastMCP server and add the tool\nserver = FastMCP()\nadd_langchain_tool_to_server(server, calculator_tool)\n\n# Run the server\nserver.run()\n```\n\n## Working with Argument Schemas\n\n### Type Annotations\n\n```python\nfrom typing import Annotated, List\nfrom langchain.tools import tool\n\n@tool(\"multiplication-tool\")\ndef multiply_type_annotation(\n    a: A…","publisher":{"name":"LangChain to MCP Tool Adapter Contributors","url":null},"homepage":"https://github.com/dovstern/langchain-to-mcp-tool-adapter","repository":"https://github.com/dovstern/langchain-to-mcp-tool-adapter","version":"0.1.3","license":null,"protocols":["mcp"],"tags":["mcp"],"pricing":null,"endpoints":[{"url":"pypi:langchain-to-mcp-tool-adapter","type":"package_pypi","auth":null,"probeable":false}],"skills":null,"tools":null,"extra":null,"attribution":{"kind":"pypi","name":"pypi","repoUrl":"pypi","summary":"pypi","version":"pypi","description":"pypi","homepageUrl":"pypi","publisherName":"pypi"}},"derived":{"capabilities":[{"slug":"dev.package-management","name":"Packages & Dependencies","confidence":0.768,"provenance":"derived"}],"categories":["dev"],"language":"en"},"observed":{"status":"unknown","statusReason":"Distributed as a package to run locally; no network endpoint to check.","lastOkAt":null,"lastProbedAt":null,"statusComputedAt":null,"reliability30d":null,"latestObservations":[],"tools":null,"package":{"name":"langchain-to-mcp-tool-adapter","registry":"pypi","observedAt":"2026-11-09T12:24:03.000Z","publishedAt":"2025-05-10T07:40:53.573526Z","latestVersion":"0.1.3"},"toolSurface":null,"endpointFacts":[]},"verification":{"claimed":false,"claimedAt":null,"proofs":[]},"provenance":{"sources":[{"source":"pypi","key":"langchain-to-mcp-tool-adapter","url":"https://pypi.org/project/langchain-to-mcp-tool-adapter/","firstSeenAt":"2026-09-09T23:24:58.670Z","fetchedAt":"2026-11-09T12:23:12.297Z","normalizedAt":"2026-11-09T12:23:12.297Z"}]},"firstSeenAt":"2026-09-09T23:24:58.670Z","updatedAt":"2026-11-09T12:24:03.000Z"}