LangChain

npm install @sigilcore/agent-hooks

import { wrapLangChainTool } from '@sigilcore/agent-hooks';

HTTP note: typed `http` requires an explicit valid method in the tool input. Inputs without a method remain legacy `web_fetch`; no default method is inferred.

const config = {
  apiKey: process.env.SIGIL_API_KEY!,
  agentId: 'my-langchain-agent',
  failMode: 'closed',
};

// Wrap any LangChain tool:
const safeTool = wrapLangChainTool(myTool, config);

// safeTool.call() now checks Sigil policy before executing
// If denied, returns a JSON rejection string the agent can parse

// The wrapped tool behaves identically to the original
// Except every call() is gated by Sigil policy first
const result = await safeTool.call('rm -rf /tmp/important');
// result = '{"sigil_decision":"DENIED","sigil_error_code":"SIGIL_POLICY_VIOLATION_BLOCKED_COMMAND"...}'