For Agent Experience Engineers - API & SDK Developers

Make your API agent-ready

Built for engineers who care about API usability. Test how coding agents interact with your API and fix issues before users hit them.

Challenges we solve

Don't know if agents can use our API
Real sandbox testing shows exactly how agents interact with your API.
Can't reproduce agent failures
Detailed logs show every step agents take, including where they fail.
No benchmark against competitors
See how your API ranks vs competitors on Devtool Arena leaderboard.
Documentation gaps hurt adoption
Identify which docs pages cause agent confusion and failures.

API Performance

Track how your API performs with AI coding agents

Run Evals

Coding Agent Leaderboard

Agent / Average	Payments	Billing	Checkout	Connect	Webhooks
1 Claude Code94%	97%	96%	92%	90%	95%
2 Codex87%	91%	89%	85%	81%	88%
3 Cursor76%	82%	78%	72%	68%	80%
4 GitHub Copilot71%	78%	74%	70%	61%	72%
5 Hermes63%	71%	65%	58%	56%	63%
6 OpenCode58%	66%	60%	54%	51%	59%

Endpoint Evaluations

How each endpoint performs across eval types

Payments API(5 endpoints)

82% pass rate

POST/v1/payment_intents
94%
POST/v1/charges
88%

Tools for engineers

Sandbox Testing

Real execution environments that test whether agents can discover, call, and use your API correctly.

Custom Evals

Write your own test scenarios. Test specific endpoints, auth flows, and edge cases.

Error Detection

Find 404s, broken redirects, and documentation gaps that cause agent failures.

llms.txt Support

Validate and optimize your llms.txt file. Ensure agents can read your structured context.

Built for technical depth

We know you want details, not dashboards. Get the data you need to debug and optimize.

Test across 12 coding agents (Claude Code, Cursor, Codex, Muse Code, etc.)
Measure discoverability, tool calls, and error rates
Track step count and execution time
Identify high-failure URLs and endpoints
Compare SDK/MCP/CLI compatibility
CI/CD integration for regression testing

Example Evaluation Result

{
  "api": "stripe",
  "agent": "claude-code",
  "score": 94,
  "metrics": {
    "discoverability": 97,
    "tool_calls": 92,
    "error_rate": 3
  },
  "steps": 8,
  "failed_urls": []
}

Is your API agent-ready?

Find out how AI coding agents interact with your API. Get specific recommendations to improve.