MCP To LangChain Tools Conversion Utility
Langchain MCP server is a hosted integration for AI assistants that speak the Model Context Protocol. MCP To LangChain Tools Conversion Utility.
A simple, lightweight library to use Model Context Protocol (MCP) server tools from LangChain.
This package is intended to simplify the use of Model Context Protocol (MCP) server tools with LangChain / TypeScript.
Once Langchain is connected, these are the calls the assistant has available:
Limitations — The Limitations tool exposed by this serverNotes — The Notes tool exposed by this serverTroubleshooting — 1. Enable debug logging: Set logLevel: "debug" to see detailed connection and execution logs 2. Check server stderr: For local MCP serversSolution — The new option, llmProvider, has been introduced for performing provider-specific JSON schema transformations:References — The References tool exposed by this serverYou will need 2 environment variables: BRAVE_API_KEY, GITHUB_PERSONAL_ACCESS_TOKEN. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
npx) to run Node.js package-based local MCP servers - [optional] uv (uvx) installed to run Python-based local (stdio) MCP serversBeing a remote server, there is no local install. You register the endpoint with your client, authorise it once, and the tools appear.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Langchain's toolset — Limitations, Notes, Troubleshooting and 2 more — is a fair guide to whether it matches your workflow. It is maintained by h1deya; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Langchain's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| Limitations | The Limitations tool exposed by this server. |
| Notes | The Notes tool exposed by this server. |
| Troubleshooting | 1. **Enable debug logging**: Set logLevel: "debug" to see detailed connection and execution logs 2. **Check server stderr**: For local MCP servers, use stderr redirection to capture server error output 3. **Test explicit |
| Solution | The new option, llmProvider, has been introduced for performing provider-specific JSON schema transformations: |
| References | The References tool exposed by this server. |
{
"mcpServers": {
"langchain-1": {
"command": "npx",
"args": ["-y", "@h1deya/langchain-mcp-tools"],
"env": {
"BRAVE_API_KEY": "your-value",
"GITHUB_PERSONAL_ACCESS_TOKEN": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
npx) to run Node.js package-based local MCP servers - [optional] uv (uvx) installed to run Python-based local (stdio) MCP servers| Variable | Description | Required |
|---|---|---|
| BRAVE_API_KEY | Credential the server authenticates with. | Yes |
| GITHUB_PERSONAL_ACCESS_TOKEN | Credential the server authenticates with. | Yes |
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