LangChain

LangChain, as a callback handler.

from rotascale.middleware import watch_langchain

with client.witness(agent) as trajectory:
    chain.invoke(question, config={"callbacks": [watch_langchain()]})

That is the whole integration. From here every call the client makes is recorded on the open trajectory.

What is distinctive

A handler rather than a wrapper, because LangChain already has the seam. Pass it where you pass any other callback and every model call, tool call and retrieval in the chain lands on the trajectory.

In context

from rotascale import Rotascale

client = Rotascale()
agent = client.agent("refund-bot")

with client.witness(agent) as trajectory:
    trajectory.authorize(GRANT, {"tools": ["issue_refund"]}, amount_minor=4_500)
    # ... your LangChain calls here, already wrapped ...

The witness block opens the trajectory and closes it on exit, including when the body raises — an episode that ended badly is exactly the one worth having a record of.

Recording without content

watch_langchain(, capture_content=False)

Shape and metadata only: model, latency, token counts, tool names. No prompt or response text. The governed facts are unchanged.

Authority is never asked for by an adapter. It stays an explicit trajectory.authorize(...) call, so importing a middleware can never become a spend decision. See authorise an action.

⌘I

Getting started

Core concepts

Guides

Integrations

What is distinctive

In context

Recording without content

​What is distinctive

​In context

​Recording without content

What is distinctive

In context

Recording without content