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Inngest vs Windmill

Windmill scores higher on the AgentReady, 64/100 against 61/100. They differ on 6 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Inngest. Inngest is an event-driven durable execution platform that allows developers to run fast, reliable code on any platform without managing queues, infrastructure, or state.

Windmill. Windmill is a fast, open-source workflow engine and developer platform.

Where Inngest is ahead

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

It also holds adopt: mcp integration available. Windmill misses it.

And on operate, idempotency support. Windmill misses it.

Where Windmill is ahead

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

It also holds adopt: agent-compatible signup flow. Inngest misses it.

And on operate, agent compatibility verified. Inngest misses it.

What neither does

Both fail openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, programmatic credential creation, structured, predictable output, machine-readable errors, retry behavior documented, 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. Both sit at 87/100 here. Inngest misses search discoverable; Windmill misses mcp discoverable.

Understand. Both sit at 46/100 here. Inngest misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented; Windmill misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented.

Adopt. Inngest leads 70 to 67. Inngest misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation; Windmill misses no mandatory sales call, programmatic credential creation, mcp integration available.

Operate is whether an agent can run against it in production and recover when a call fails. Windmill leads 56 to 41. Inngest misses structured, predictable output, machine-readable errors, retry behavior documented, rate-limit behavior predictable, agent compatibility verified; Windmill misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Inngest starts at $99/mo and has a free tier. Windmill does not publish one and has a free tier.

Signal by signal

Which to pick

Signal counts are level here, so fit and price decide it. Full profiles: Inngest and Windmill. Alternatives to each: Inngest, Windmill.

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