# Stability AI — API Agent Score

> Score: 60/100 (Grade: C) | Domain: stability.ai | Rubric: 1.0.0 | Checked: July 24, 2026

Stability AI scored 60/100 (C), classified "partially-ready".

[View full report](https://www.postman.com/ai/ai-ready-apis/company/stability)
[All organizations](https://www.postman.com/ai/ai-ready-apis/llms.txt)

## Summary

- Overall: 60/100 (C)
- Classification: partially-ready

## Category Scores

- API Design: 96/100 (A+)
- Developer Experience: 55/100 (D)
- Agent Discovery: 69/100 (C)
- Agent Understanding: 59/100 (D)
- Agent Usability: 40/100 (F)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — Versioning declared (info.version="v1") and url-versioning detected. Investigated: spec 100%, docs 100%.
- [pass] Auth declared & discoverable — Authentication required (global or on every operation). Investigated: spec 100%, docs 100%.
- [warn] Schema coverage & depth — Medium parameter complexity (avg 2 params/op; nested/body schemas present). Investigated: spec 83%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 50%.
- [pass] Example coverage — 82% example coverage across params + responses. Investigated: spec 100%, docs 0%.

### Developer Experience

- [pass] Description completeness — 64% description completeness (target 90%+). Investigated: spec 100%.
- [pass] Changelog published — Newest official SDK activity 70 day(s) ago. Investigated: sdk 100%, spec 0%, docs 0%.
- [warn] Quickstart present — Quickstart page reachable (24 variants scanned starting at https://platform.stability.ai/docs/api-reference/quickstart) but no runnable code sample detected in HTML or .md variant. Investigated: docs 50%.
- [fail] Self-service developer portal — No signup page detected across conventional paths (/signup, /sign-up, /register, /get-started, /console/signup, /dashboard/signup, /try, /try-free, /free, /free-trial, /start, /start-free). Investigated: docs 0%.
- [fail] Code samples in docs — No detectable code samples across 1 sampled docs pages. Investigated: docs 0%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (slu-biochar/biocharstability, 1116 snippets). Investigated: docs 100%, sdk 100%, cli 0%, mcp 0%, wellknown 0%.
- [warn] Docs reachable, not hard auth-gated — 1 of 1 pages return 200 for non-existent URLs (soft 404). Investigated: docs 50%.
- [warn] llms.txt present, valid & comprehensive — No llms.txt found at any candidate location (https://platform.stability.ai/docs/api-reference/llms.txt, https://platform.stability.ai/llms.txt, https://platform.stability.ai/docs/llms.txt). Investigated: docs 33%.
- [warn] Crawlable / AEO — Sitemap present (0 entries) but carries no lastmod values. Investigated: wellknown 75%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — 5 distinct 4xx/5xx response codes documented. Investigated: docs 100%, spec 50%.
- [warn] Agent-navigable, token-efficient docs — No pages support .md URLs (0/1 tested). Investigated: docs 71%.
- [fail] Operation purpose clarity — 57% of operations are agent-inferable. Investigated: spec 0%.
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.
- [fail] Docs structured data — Neither JSON-LD nor OpenGraph/meta tags detected across 1 sampled pages — likely a CSR-only docs site. Investigated: docs 0%.
- [skip] Description consistency across surfaces — Only 0 surface description(s) with ≥6 tokens available; need at least 2 to compare.

### Agent Usability

- [fail] Idempotency documented — 0% of mutating operations document idempotency. Investigated: spec 0%, docs 0%.
- [fail] Rate-limit signaling — No rate-limit response headers documented. Investigated: spec 0%, docs 0%.
- [fail] Pagination documented & consistent — 1 list endpoint(s) exist but no pagination params found. Investigated: spec 0%, docs 0%.
- [fail] Sandbox separation — No sandbox/test server declared across 1 server entries; no test-key prefixes documented. Investigated: spec 0%, docs 0%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.

## Executive Summary

Stability's API design is a genuine strength — the contract is clean and machine-readable, giving partners and their agents a solid foundation to build against. The critical gaps are in agent understanding and agent usability: operations lack the semantic clarity and structured context agents need to act correctly, while missing reliability signals (idempotency, rate-limit headers, pagination) and no sandbox environment make autonomous or partner-led integration unpredictable and risky. Closing these gaps — starting with operational reliability and agent-readable context — is the fastest path to a partner program that agents can run without hand-holding.