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Last9 vs Vellum

Vellum scores higher on the AgentReady, 88/100 against 48/100. They differ on 18 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Last9. Last9 is an observability platform for logs, metrics, and traces.

Vellum. A personal AI assistant that lives in the secure Vellum Cloud, has its own identity, and actually does things in the world.

Where Last9 is ahead

Last9 passes agent compatibility verified, and Vellum does not. That is operate, whether an agent can run against it in production and recover when a call fails.

Where Vellum is ahead

Vellum passes search discoverable, and Last9 does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference, openapi / spec quality, pricing understandable, request examples provided, response examples provided and errors and status codes documented. Last9 misses those.

And on adopt, self-service signup, no mandatory sales call, programmatic credential creation, free trial or free allowance, fast time to first request and cli available. Last9 misses those.

Finally, on operate, structured, predictable output, machine-readable errors, retry behavior documented and observable execution. Last9 misses those.

What neither does

Both fail authentication documented, limits / constraints documented, idempotency support, rate-limit behavior predictable. 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. Vellum leads 100 to 87. Last9 misses search discoverable; Vellum misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Vellum leads 85 to 15. Last9 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; Vellum misses authentication documented, limits / constraints documented.

Adopt. Vellum leads 100 to 50. Last9 misses self-service signup, no mandatory sales call, programmatic credential creation, free trial or free allowance, fast time to first request, cli available; Vellum misses nothing.

Operate. Vellum leads 67 to 41. Last9 misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution; Vellum misses idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Last9 does not publish a machine-readable starting price. Vellum starts at $30/mo and has a free tier.

Signal by signal

Which to pick

Vellum clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Last9 and Vellum. Alternatives to each: Last9, Vellum.

An agent can fetch this as data: POST /v1/compare {"slugs": ["last9", "vellum"]}