pruv-langchain

Cryptographic verification for LangChain agents. Every tool call, LLM invocation, chain execution, and agent action — automatically recorded into a pruv identity chain.

pip install pruv-langchain

Usage

from pruv_langchain import LangChainWrapper

wrapped = LangChainWrapper(agent, agent_id="agent-id", api_key="pv_live_...")
result = wrapped.invoke({"input": "deploy to production"})
receipt = wrapped.receipt()

Hooks into LangChain's native BaseCallbackHandler. Your agent code stays unchanged. pruv runs underneath it.

How it works

PruvCallbackHandler intercepts LangChain lifecycle events:

• on_tool_start / on_tool_end — tool executions
• on_llm_start — LLM invocations
• on_agent_action — agent decisions
• on_chain_start / on_chain_end — chain executions
• on_retriever_start — retriever queries

Every event is posted to the pruv identity chain via POST /api/identity/act. The chain is tamper-evident — modify one entry and verification detects exactly where.

Links

• pruv.dev
• Documentation
• GitHub