Agent-Friendliness Report
Customer.io API
Automated messaging based on user behaviour and events.
Good
CLI Readiness 8/10 · Quality 7/10
CLI Readiness
8/10- ✓Official SDK available+2
- ✓Env var authentication+2
- ✓Headless / CI compatible+2
- ✗CLI tool available+1
- ✓JSON responses+1
- ✓curl / CLI doc examples+1
- ✓Reasonable rate limits+1
- ✗Machine-readable pricing+1
Quality Score
7/10- npm weekly downloads292K
- GitHub stars4K
- Days since last release25
- Issue close ratio73%
- TypeScript support✓
- Docs qualityExcellent
- Breaking changesOccasional
Want to improve your score? Here's how
- ->Make pricing machine-readable - Expose pricing as markdown, JSON, or a static table instead of JS widgets
How we calculate this score
The Agent-Friendliness Score measures how well an API works when used by AI coding agents (Claude Code, Cursor, Copilot) rather than humans in browsers.
CLI Readiness (60%) scores 8 signals that matter for headless, automated use: official SDK availability, env var auth (no browser OAuth), headless compatibility, CLI tooling, JSON responses, curl examples in docs, rate limits, and machine-readable pricing. Each signal is weighted by how much it blocks or enables agent workflows.
Quality (40%) covers SDK maturity and maintenance: npm download volume, GitHub stars, release freshness, issue close rate, TypeScript support, docs quality, and breaking change frequency.
Docs Benchmark (where available) is sourced from Context7, which tests how well an LLM can answer practical questions using the library's documentation.
Coming soon: live agent benchmarks that measure tokens burned, success rate, and time to first working API call using real integration tasks.
How agent-friendly is YOUR API?
Check your score at clirank.dev/score