@edictum/langchain

LangChain.js adapter for Edictum rule enforcement.

Part of Edictum — runtime rule enforcement for AI agent tool calls.

Install

pnpm add @edictum/langchain @edictum/core

Usage

import { Edictum } from '@edictum/core'
import { LangChainAdapter } from '@edictum/langchain'

const guard = Edictum.fromYaml('rules.yaml')
const adapter = new LangChainAdapter(guard)
const middleware = adapter.asMiddleware()
// Pass to ToolNode or agent as tool_call_middleware

API

• LangChainAdapter — adapter class
  • asMiddleware(options?) — returns { name, wrapToolCall } for ToolNode
  • asToolWrapper(options?) — returns a wrapper function for any tool callable
  • setPrincipal(principal) — update principal mid-session
• LangChainAdapterOptions — constructor options (sessionId, principal, principalResolver)
• AsMiddlewareOptions — { onPostconditionWarn } callback

Links

• Full documentation
• GitHub
• All packages