Compare

JSR vs Verdaccio

JSR scores higher on the AgentReady, 50/100 against 39/100. They differ on 7 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

JSR. The open-source package registry for modern JavaScript and TypeScript.

Verdaccio. Verdaccio is a simple, zero-config-required local private NPM registry.

Where JSR is ahead

JSR passes public docs discoverable, and Verdaccio 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. Verdaccio misses it.

And on adopt, self-service signup and official python sdk. Verdaccio misses those.

Finally, on operate, agent compatibility verified. Verdaccio misses it.

Where Verdaccio is ahead

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

What neither does

Both fail llms.txt published, llms-full.txt / full agent docs, structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution. 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. Verdaccio leads 73 to 67. JSR misses search discoverable, clear canonical domain, llms.txt published, llms-full.txt / full agent docs; Verdaccio misses public docs discoverable, llms.txt published, llms-full.txt / full agent docs.

Understand. JSR leads 31 to 23. JSR misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Verdaccio misses structured api reference, openapi / spec quality, authentication documented, 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. JSR leads 60 to 35. JSR misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; Verdaccio misses self-service signup, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, official python sdk.

Operate. JSR leads 41 to 24. JSR misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution; Verdaccio misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified.

Pricing

JSR does not publish a machine-readable starting price and has a free tier. Verdaccio does not publish one and has a free tier.

Signal by signal

Which to pick

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

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