Integrations
LangChain
Wrap your LangChain tools or attach an Interven callback handler.
Two ways to use Interven with LangChain — pick whichever fits your code.
Option A — wrap individual tools
from interven_langchain import guard
from langchain.tools import StructuredTool
raw_tool = StructuredTool.from_function(send_email, name="send_email")
guarded = guard(raw_tool, api_key="iv_live_...")
agent.invoke({"input": "..."}, tools=[guarded])Every _run invocation is scanned before executing. DENY raises InterventBlockedError.
SANITIZE rewrites the input arguments to the redacted version.
Option B — global callback
from langchain_core.runnables import RunnableConfig
from interven_langchain import InterventCallback
cb = InterventCallback(api_key="iv_live_...", on_block="raise")
agent.invoke(prompt, config=RunnableConfig(callbacks=[cb]))Hooks on_tool_start for every tool the chain invokes. Lighter touch, no per-tool
wrapping.
Modes for blocked calls
InterventCallback(api_key=..., on_block="raise") # raises an exception
InterventCallback(api_key=..., on_block="return_message") # returns "[blocked]" to the LLMInstall
pip install interven-langchainThe package depends on interven (the base SDK) and langchain-core>=0.2.