langchain-zambo

Publish LangChain lifecycle events as public, verifiable receipts at zambo.dev.

Install

pip install langchain-zambo

Ten-line example

from langchain_zambo import ZamboCallbackHandler
from langchain_openai import ChatOpenAI

handler = ZamboCallbackHandler()
llm = ChatOpenAI(callbacks=[handler])
llm.invoke("Summarize this task")
print(handler.last_receipt_url)

The callback prints each public https://zambo.dev/run/{id} URL and keeps the most recent URL in last_receipt_url. It records LLM, tool, and chain lifecycle events through the live Zambo MCP endpoint. The receipt describes what the endpoint recorded and observed. It does not prove an outside outcome that the endpoint did not observe.

Set ZAMBO_API_URL when using a compatible Zambo host. Callback failures are available in receipt_errors and do not replace the original LangChain result.

Project homepage: https://zambo.dev