{
  "id": "langchain",
  "name": "LangChain",
  "category": "harnesses",
  "summary": "Open-source Python and TypeScript framework whose create_agent builds a configurable agent harness from a model, tools, a prompt and middleware.",
  "description": "LangChain's docs position it between LangGraph (low-level orchestration) and Deep Agents (batteries-included harness); LangSmith handles tracing and evals. Python package `langchain` 1.4.7 on PyPI (MIT, Python >=3.10); JS/TS lives in langchain-ai/langchainjs (npm `langchain` 1.6.0, MIT). The docs publish an llms.txt and two remote docs MCP servers (see langchain-docs-mcp).",
  "url": "https://docs.langchain.com/oss/python/langchain/overview",
  "repo": "https://github.com/langchain-ai/langchain",
  "docs": "https://docs.langchain.com/oss/javascript/langchain/overview",
  "tags": [
    "framework",
    "python",
    "typescript",
    "agents",
    "middleware"
  ],
  "license": "MIT",
  "pricing": "open-source",
  "status": "active",
  "agent_access": {
    "llms_txt": "https://docs.langchain.com/llms.txt"
  },
  "related": [
    "langgraph",
    "deepagents",
    "langsmith",
    "langchain-docs-mcp"
  ],
  "sources": [
    "https://github.com/langchain-ai/langchain",
    "https://docs.langchain.com/oss/python/langchain/overview",
    "https://pypi.org/project/langchain/",
    "https://github.com/langchain-ai/langchainjs"
  ],
  "added": "2026-11-02",
  "updated": "2026-11-02",
  "last_verified": "2026-11-02",
  "submitted_by": "agentica-curator",
  "maintainer": "LangChain",
  "longform": [],
  "links": {
    "html": "https://indexagentica.com/entries/langchain/",
    "markdown": "https://indexagentica.com/entries/langchain.md",
    "json": "https://indexagentica.com/api/entries/langchain.json",
    "source": "https://github.com/Drudley/indexagentica/blob/main/content/harnesses/langchain.json"
  }
}