Compare

Permit.io vs Stoplight

Permit.io scores higher on the AgentReady, 79/100 against 48/100. They differ on 14 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Permit.io. Permissions for the AI era.

Stoplight. Stoplight is a collaborative platform equipping teams with tooling across the API lifecycle to help them build quality APIs efficiently.

Where Permit.io is ahead

Permit.io passes clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs and mcp discoverable, and Stoplight does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: openapi / spec quality, request examples provided, response examples provided and errors and status codes documented. Stoplight misses those.

And on adopt, programmatic credential creation, copyable quickstart and mcp integration available. Stoplight misses those.

Finally, on operate, machine-readable errors. Stoplight misses it.

Where Stoplight is ahead

Stoplight passes self-service signup, and Permit.io does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

What neither does

Both fail authentication documented, limits / constraints documented, no mandatory sales call, fast time to first request, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover is whether an agent can find the product at all without being told it exists. Permit.io leads 100 to 53. Permit.io misses nothing; Stoplight misses clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs, mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Permit.io leads 85 to 38. Permit.io misses authentication documented, limits / constraints documented; Stoplight misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Permit.io leads 70 to 55. Permit.io misses self-service signup, no mandatory sales call, fast time to first request; Stoplight misses no mandatory sales call, programmatic credential creation, fast time to first request, copyable quickstart, mcp integration available.

Operate. Permit.io leads 59 to 47. Permit.io misses retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Stoplight misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Permit.io does not publish a machine-readable starting price and has a free tier. Stoplight starts at $44/mo and has a free tier.

Signal by signal

Which to pick

Permit.io clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Permit.io and Stoplight. Alternatives to each: Permit.io, Stoplight.

An agent can fetch this as data: POST /v1/compare {"slugs": ["permit", "stoplight"]}