Vespa

Fair

Agent Native Score

Free TierAPI Key AuthOpenAPI Spec

Vespa is an open-source big data serving engine that combines search, recommendation, and machine learning capabilities for building low-latency, scalable applications. It provides a full-stack platform for implementing advanced information retrieval and personalization at scale.

Categories: Search · Machine Learning · Database

#18 of 19 in Search · #6 of 7 in Machine Learning · #42 of 69 in Database

Checklist Breakdown

13 of 33 checks passed. 14 unscored.

Discovery 63%

Can an agent find and understand this tool without a web search?

✓ Published OpenAPI/Swagger spec

✗ Has llms.txt or llms-full.txt

✗ Has an MCP server (official or well-maintained)

✗ MCP server listed in a public registry

✓ API reference docs are publicly accessible

✓ Docs include runnable code examples

✓ Has a public changelog or release notes

✓ Has a public status page

Auth & Onboarding 50%

Can an agent create an account and get credentials without human intervention?

✗ Signup does not require CAPTCHA

✗ Signup does not require phone verification

✓ Supports API key auth (not only OAuth)

✗ API key obtainable without manual approval

✓ No mandatory billing info to start

✓ Can sign up without creating an organization

Pricing 100%

Can an agent operate autonomously without upfront payment or contracts?

✓ Has a free tier

✓ Usage-based pricing available

✓ No minimum contract or commitment

✓ Pricing page is public (no 'contact sales')

✓ Free tier sufficient for testing (not just a trial)

Agent Tooling Not yet scored

How well does the API work for non-human consumers?

— SDK available in 2+ languages

— Structured error responses (JSON with error codes)

— Idempotency support on write endpoints

— Pagination on list endpoints

— Webhook/event support

— Sandbox or test mode available

— Rate limit headers in responses

— Consistent REST resource naming

Reliability Not yet scored

Does the tool fail gracefully when an agent makes a mistake?

— Meaningful error messages (not just 500)

— 429 responses include Retry-After header

— Documented uptime SLA (99.9%+)

— Graceful degradation under rate limits

— Request IDs in responses for debugging

— API versioning supported

Reviewer Notes

Vespa has solid documentation and an OpenAPI spec, making discovery reasonably straightforward for agents. However, it's primarily a self-hosted or cloud-deployed engine rather than a SaaS platform, so programmatic account creation is not applicable—agents would need human setup of infrastructure. The agent tooling is decent with structured JSON APIs and good error handling, but lacks an MCP server and llms.txt file that would make integration more seamless. Reliability is strong as an open-source project with good uptime in production deployments. The free tier exists but requires deployment effort, making autonomous agent operation without infrastructure knowledge challenging.

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