HELM governance adapter for langchain — fail-closed tool calling for AI agents
Project description
helm-langchain
HELM governance adapter for LangChain.
What it does
Wraps LangChain tools with HELM governance:
- Every tool call is evaluated against HELM policy before execution
- Denied calls raise
HelmToolDenyError(fail-closed by default) - Receipts with SHA-256 hashes are collected for every approved execution
Quick start
from helm_langchain import HelmToolWrapper
wrapper = HelmToolWrapper(helm_url="http://localhost:8080")
governed_tools = wrapper.wrap_tools(my_tools)
# Use in a LangChain agent
agent = create_react_agent(llm, governed_tools)
Configuration
| Parameter | Default | Description |
|---|---|---|
helm_url |
http://localhost:8080 |
HELM kernel URL |
api_key |
None |
HELM API key |
fail_closed |
True |
Deny on HELM errors |
collect_receipts |
True |
Keep receipt chain |
timeout |
30.0 |
HTTP timeout seconds |
License
Apache-2.0
Release history Release notifications | RSS feed
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