clarvia-langchain

LangChain integration for Clarvia AEO (Agent Experience Optimization) scoring. Gate your LangChain tool calls based on how agent-friendly the target service is.

Installation

pip install clarvia-langchain

Quick Start

from clarvia_langchain import CriteriaGate, GatedTool
from langchain_community.tools import SerpAPIWrapper

# 1. Create a gate with your Clarvia API key
gate = CriteriaGate(
    api_key="clv_xxx",
    min_rating="AGENT_FRIENDLY",  # Block services scoring below 70
)

# 2. Wrap any LangChain tool
search = SerpAPIWrapper()
gated_search = GatedTool(
    tool=search,
    gate=gate,
    service_url="https://serpapi.com",
)

# 3. Use normally — the gate checks AEO score before each call
result = gated_search.invoke({"query": "latest AI news"})

Rating Tiers

Configuration

gate = CriteriaGate(
    api_key="clv_xxx",
    min_rating="AGENT_FRIENDLY",  # or ServiceRating enum
    cache_ttl=3600,               # Cache scores for 1 hour (default)
    timeout=10.0,                 # HTTP timeout in seconds
)

Handling Blocked Calls

from clarvia_langchain import GatedTool, GateBlockedError

# Option 1: Raise on block (default)
gated = GatedTool(tool=my_tool, gate=gate, service_url="...")
try:
    result = gated.invoke({"query": "test"})
except GateBlockedError as e:
    print(f"Blocked: {e.gate_result.reason}")
    print(f"Try these instead: {e.gate_result.alternatives}")

# Option 2: Return error string (for agent consumption)
gated = GatedTool(
    tool=my_tool, gate=gate,
    service_url="...",
    raise_on_block=False,
)
result = gated.invoke({"query": "test"})
# result = "BLOCKED: ... | Alternatives: ..."

Direct Gate Usage

gate = CriteriaGate(api_key="clv_xxx")
result = gate.check("https://some-api.com")

print(result.allowed)       # True/False
print(result.score)         # 0-100
print(result.rating)        # ServiceRating enum
print(result.alternatives)  # List of suggested alternatives

CrewAI Integration

clarvia-langchain works with any LangChain-compatible framework, including CrewAI.

from crewai import Agent, Task, Crew
from crewai_tools import SerperDevTool
from clarvia_langchain import CriteriaGate, GatedTool

# 1. Set up the gate
gate = CriteriaGate(api_key="clv_xxx", min_rating="AGENT_FRIENDLY")

# 2. Wrap any CrewAI-compatible tool
search = SerperDevTool()
gated_search = GatedTool(
    tool=search,
    gate=gate,
    service_url="https://serper.dev",
)

# 3. Use with CrewAI agents
researcher = Agent(
    role="Research Analyst",
    goal="Find reliable data from agent-friendly sources",
    tools=[gated_search],
)

task = Task(
    description="Research the latest trends in AI agent tooling",
    agent=researcher,
    expected_output="A summary of key trends",
)

crew = Crew(agents=[researcher], tasks=[task])
result = crew.kickoff()

The gate transparently checks AEO scores before each tool call. If a service scores below the threshold, the agent receives a structured error with suggested alternatives, allowing it to adapt its strategy.

API Behavior

• Caching: Scores are cached in-memory with a 1-hour TTL by default. Use gate.clear_cache() to reset.
• Fallback: If the Clarvia API is unreachable, calls are allowed through with a warning log (fail-open).
• Async: Both sync and async paths are supported (gate.check() / gate.acheck()).

Development

pip install -e ".[dev]"
pytest

License

MIT