agentrial 0.1.3

Statistical evaluation framework for AI agents - pytest for agent trajectories

agentrial

Your agent passes Monday, fails Wednesday. agentrial tells you why.

Statistical evaluation framework for AI agents. Like pytest, but for non-deterministic systems.

Why agentrial?

• Statistical rigor: Every test runs N trials with Wilson confidence intervals — not "it passed once"
• Trajectory analysis: Step-by-step failure attribution identifies exactly which tool call diverged
• Cost tracking: Real API costs from model metadata, not estimates
• CI/CD ready: GitHub Action that blocks PRs when reliability drops

Quick Start

pip install agentrial

Create a test file agentrial.yml:

suite: my-agent-tests
agent: my_agent.agent  # Python import path
trials: 10
threshold: 0.85

cases:
  - name: basic-math
    input:
      query: "What is 15 * 37?"
    expected:
      output_contains: ["555"]
      tool_calls:
        - tool: calculate

Run:

agentrial run

Output:

╭──────────────────────────────────────────────────────────────────────────────╮
│ my-agent-tests - PASSED                                                      │
╰────────────────────────────────────────────────────── Threshold: 85.0% ──────╯
┏━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Test Case              ┃ Pass Rate┃ 95% CI          ┃ Avg Cost ┃ Avg Latency┃
┡━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━┩
│ basic-math             │   100.0% │ (72.2%-100.0%)  │  $0.0005 │      1.59s │
└────────────────────────┴──────────┴─────────────────┴──────────┴────────────┘

Overall Pass Rate: 100.0% (72.2%-100.0%)
Total Cost: $0.005

Real-World Results

Tested with Claude 3 Haiku on a 3-tool agent (calculator, country lookup, temperature conversion):

Test Complexity	Pass Rate	95% CI	Avg Cost	Avg Latency	Avg Tokens
Easy (direct tool call)	100%	72.2%-100%	$0.0005	1.6s	1,513
Medium (inference + tool)	100%	72.2%-100%	$0.0006	2.6s	1,926
Hard (multi-step reasoning)	100%	72.2%-100%	$0.0010	3.5s	2,986

100 trials total, $0.06 total cost, full trajectory capture.

Test Case Options

cases:
  - name: my-test
    input:
      query: "User question"
      context: {}  # Optional context dict
    expected:
      # All strings must be present (AND logic)
      output_contains: ["expected", "words"]

      # At least one string must be present (OR logic)
      output_contains_any: ["option1", "option2", "option3"]

      # Regex pattern
      regex: "\\d+ results found"

      # Expected tool calls
      tool_calls:
        - tool: search
          params_contain: {query: "expected"}

CI/CD Integration

Add to .github/workflows/agent-eval.yml:

name: Agent Evaluation
on: [push, pull_request]

jobs:
  eval:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"
      - run: pip install agentrial
      - run: agentrial run --threshold 0.85
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}

LangGraph Integration

from langchain_anthropic import ChatAnthropic
from langgraph.prebuilt import create_react_agent
from agentrial.runner.adapters import wrap_langgraph_agent

# Your LangGraph agent
llm = ChatAnthropic(model="claude-3-haiku-20240307")
graph = create_react_agent(llm, tools=[...])

# Wrap for agentrial
agent = wrap_langgraph_agent(graph)

Then reference in your test file:

agent: my_module.agent

CLI Reference

agentrial run [PATH]           # Run tests (default: current directory)
agentrial run --trials 20      # Override trial count
agentrial run --threshold 0.9  # Override pass threshold
agentrial run -o results.json  # Export JSON report

agentrial compare -b baseline.json current.json  # Compare runs
agentrial init                                   # Initialize project

Supported Frameworks

• LangGraph (native adapter with full trajectory capture)
• CrewAI (coming soon)
• AutoGen (coming soon)
• Pydantic AI (coming soon)

Statistical Methods

• Pass rate CI: Wilson score interval (accurate for small N and extreme proportions)
• Cost/latency CI: Bootstrap resampling (500 iterations)
• Regression detection: Fisher exact test for pass rate, Mann-Whitney U for metrics
• Failure attribution: Trajectory divergence analysis between passed/failed trials

License

MIT