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Cerbos vs Clerk

Clerk scores higher on the AgentReady, 48/100 against 46/100. They differ on 4 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Cerbos. Authorization management platform for applications, APIs, AI agents, MCP servers, services, and workloads.

Clerk. Clerk provides full-stack authentication and user management with products such as Organizations, Billing, and more.

Where Cerbos is ahead

Cerbos passes search discoverable, and Clerk does not. That is discover, whether an agent can find the product at all without being told it exists.

Where Clerk is ahead

Clerk passes clear canonical domain, and Cerbos does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: authentication documented. Cerbos misses it.

And on adopt, cli available. Cerbos misses it.

What neither does

Both fail structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request, structured, predictable output, machine-readable errors, 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. Cerbos leads 93 to 87. Cerbos misses clear canonical domain; Clerk misses search discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Clerk leads 23 to 15. Cerbos misses structured api reference, openapi / spec quality, authentication documented, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Clerk misses structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Clerk leads 48 to 40. Cerbos misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request, cli available; Clerk misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request.

Operate. Both sit at 35/100 here. Cerbos misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Clerk misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Cerbos does not publish a machine-readable starting price. Clerk does not publish one.

Signal by signal

Which to pick

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

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