mcp-bastion-langchain

Security middleware for LangChain powered by MCP-Bastion.

Protects your LangChain agents from prompt injection, PII leakage, and resource exhaustion.

Install

pip install mcp-bastion-langchain

Usage

Callback (automatic protection)

from langchain_openai import ChatOpenAI
from mcp_bastion_langchain import BastionSecurityCallback

llm = ChatOpenAI(callbacks=[BastionSecurityCallback()])
llm.invoke("Hello, what is MCP?")

Tool decorator

from mcp_bastion_langchain import secure_tool

@secure_tool
def my_tool(query: str) -> str:
    return f"Result for {query}"

Features

Content filtering on all LLM prompts and tool inputs
Rate limiting per caller
Prompt injection detection
PII redaction

License

Same terms as the MCP-Bastion project: see LICENSE. Non-commercial use is free with required citation/attribution; copyright terms apply. Commercial use as defined in the License may need a separate agreement (COMMERCIAL_LICENSE.md).

Development Status
- 4 - Beta
Intended Audience
- Developers
License
- Other/Proprietary License
Programming Language
- Python :: 3
Topic
- Security

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Source Distribution

mcp_bastion_langchain-5.1.0.tar.gz (3.2 kB view details)

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- Subject name: mcp_bastion_langchain-5.1.0.tar.gz
- Subject digest: cadd80fb113b3782de85e56fd7782bb27e6e03544c661285fed189023269a591
- Sigstore transparency entry: 2484940099
- Sigstore integration time: Aug 16, 2026
Source repository:
- Permalink: vaquarkhan/MCP-Bastion@afa2afb098e23952b82b3fa417f4677445ff9efa
- Branch / Tag: refs/tags/integration-v5.1.0
- Owner: https://github.com/vaquarkhan
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- Trigger Event: push