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langchain-hs-mcp: Model Context Protocol (MCP) client for langchain-hs

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First-class MCP JSON-RPC 2.0 client supporting stdio and HTTP transports. Enables Haskell agents to discover and call tools published by any MCP server (e.g. Hackage docs, SQLite, filesystem, GitHub). Depends only on langchain-hs-core; no provider-specific dependencies.

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Versions [RSS] 0.0.6.0
Change log CHANGELOG.md
Dependencies aeson (>=2.0 && <3), base (>=4.17 && <5), bytestring (>=0.10 && <0.13), http-conduit (>=2 && <3), langchain-hs-core (>=0.0.6 && <0.0.7), mtl (>=2.2 && <2.4), process (>=1.6 && <1.7), text (>=1.2 && <3) [details]
Tested with ghc ==9.12.4, ghc ==9.10.3, ghc ==9.8.4
License MIT
Copyright 2025-2026 Tushar Adhatrao
Author Tushar Adhatrao
Maintainer tusharadhatrao@gmail.com
Uploaded by tusharad at 2026-10-14T21:34:05Z
Category AI
Home page https://github.com/tusharad/langchain-hs#readme
Bug tracker https://github.com/tusharad/langchain-hs/issues
Source repo head: git clone https://github.com/tusharad/langchain-hs
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Readme for langchain-hs-mcp-0.0.6.0

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langchain-hs-mcp

Model Context Protocol (MCP) client for langchain-hs.

Connect Haskell agents to any MCP server over stdio or HTTP JSON-RPC 2.0. Depends only on langchain-hs-core — no provider dependencies.

Installation

# package.yaml / .cabal
dependencies:
  - langchain-hs-mcp

Usage

import Langchain.MCP.Client
import Control.Monad.Except (runExceptT)

main :: IO ()
main = do
  let client = newStdioMcpClient "hackage" "docker" ["run", "-i", "--rm", "mcp/hackage-doc"]
  res <- runExceptT $ listMcpTools client
  case res of
    Left err    -> print err
    Right tools -> mapM_ (print . mcpToolName) tools