Instrument LangChain

Recipe — instrument LangChain. Pointer to the SDK langchain_instrumented sample.

Private preview. This surface is not yet generally available. Adapters live in the Python SDK today and the rendering / configuration UX is under iteration. Contact [email protected] to request access to the private preview.

Canonical sample: samples/integrations/langchain_instrumented.py — auto-capture LangChain LCEL chain execution with LangChainCallbackHandler. Drop-in: no manual trace upload needed.

Quick wire-up

pip install 'layerlens[providers-openai]' # plus your LangChain extras

from layerlens import Stratix
from layerlens.instrument.adapters.frameworks.langchain import LangChainCallbackHandler

client = Stratix()
handler = LangChainCallbackHandler(client)
chain.invoke(input, config={"callbacks": [handler]})

The handler emits model.invoke, cost.record, and tool.call events to the configured HTTP sink.

See also

• SDK sample: langchain_instrumented.py
• SDK adapter doc: LangChain
• Integrations