Prism
Apache-2.0
Turns an OpenAPI description into a running mock server that validates requests and returns example or dynamic responses — an API you can call before one exists.
OpenAPI
Specifications it implements
What this tool does to each specification, in the role vocabulary. Follow a standard through to standards.apievangelist.com for what it actually specifies.
| Standard | Role | What that means |
|---|---|---|
| OpenAPI | mocks |
Using this from an agent
- Interfaces
clicontainerlibrary- Install
-
npm
@stoplight/prism-cli - Invoke
npx @stoplight/prism-cli mock <spec.yaml> --port 4010- Consumes
- openapi
- Emits
- http
- Runtime
- Runs offline Non-deterministic Read-only No credentials
Where it applies
Jobs this tool actually does, and the surface each one is exercised on.
Exercise an integration end to end with no credentials, no cost and no production side effects.
coding-agent
The safest way for an autonomous agent to verify its own integration code. A mock cannot charge a card, send an email, or delete a record.
Unblock frontend work while the backend is still being built.
coding-agenthuman
Run contract validation in proxy mode against a real API to find where it diverges from its description.
ci-pipeline
- Website
- https://stoplight.io/open-source/prism
- Repository
- https://github.com/stoplightio/prism
- License
- Apache-2.0 — reported by the GitHub API, verified 2026-08-11
- Stars
- 5004 · last commit 2026-08-07
- Matching caveat
- The name is an ordinary English word, so the job-corpus matcher cannot use it — sampled matches were "Raytheon financial systems (i.e. IPDS, APEX, Prism)", "Workday Report Writer … Prism" The bare name is blocked in the matcher, so this count reflects only qualified matches. Real adoption needs another source.
Reading this as an agent? Don't scrape the page — this entry is published as
structured data at
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All tools by adoption
/tools.json,
against the tool.schema.json
schema, using the roles.json
vocabulary. Start at /llms.txt.