APort Agent Guardrail for LangChain
APort Agent Guardrail for LangChain/LangGraph — pre-action authorization for AI agents: an AsyncCallbackHandler that verifies every tool call against your passport and policies before execution. On deny, raises GuardrailViolation.
Install
pip install aport-agent-guardrails-langchain
Requires aport-agent-guardrails (core); installs automatically.
Setup
aport-langchain setup
- Writes config to
~/.aport/langchain/config.yaml. - Run the passport wizard with:
npx @aporthq/aport-agent-guardrails --framework=langchain.
Usage
from aport_guardrails_langchain import APortCallback, GuardrailViolation
# Add callback to your agent
agent = initialize_agent(
tools=tools,
llm=llm,
callbacks=[APortCallback()]
)
# On deny, the callback raises GuardrailViolation
try:
result = await agent.ainvoke(...)
except GuardrailViolation as e:
print(f"Blocked: {e.code} — {e}")
print("Reasons:", e.reasons)
Config is auto-loaded from .aport/config.yaml or ~/.aport/langchain/config.yaml. Override with APortCallback(config_path="/path/to/config.yaml").
Config
- mode:
local|api - passport_path: path to passport JSON (local mode)
- agent_id:
ap_xxx(API mode, hosted passport) - api_url: optional; default
https://api.aport.io
Tests
cd python/langchain_adapter
pip install -e ".[dev]"
pip install -e ../aport_guardrails
pytest tests/ -v
Links
1 maintainer
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