Httpbinhttpbin.org
Httpbin's API contract and discoverability are functional, but the partner onboarding experience is critically underdeveloped — there is no self-service portal, no quickstart, no code samples, and no changelog, meaning partners and their AI agents have no guided path from discovery to a working integration. The two areas demanding immediate attention are Developer Experience (no portal, no examples, incomplete descriptions) and Agent Usability (zero idempotency documentation, no rate-limit signaling), both of which will cause partner integrations to stall or behave unpredictably in production.
API DesignA clean, typed, well-governed API contract agents can reason about2 pass2 warn1 fail64C
| Signal | Points | Findings | Rationale | |
|---|---|---|---|---|
| warn | Schema coverage & depthvia spec | 16.7/25 | Only 0% of the 78 operations document request and response schemas, so an agent can't do function-calling against most endpoints. Investigated: spec 67%, sdk 0%. Fix: Add request and response schemas to enable agent function-calling. | Typed, complete request/response schemas are what make agent function-calling possible. |
| pass | Security & governance hygienevia spec | 15/15 | No credential-shaped strings detected in spec. Investigated: spec 100%, sdk 100%, wellknown 0%. | No leaked secrets, no critical lint violations, no OWASP API Top-10 spec smells, and a published vulnerability-disclosure channel. |
| warn | Machine-readable, versioned contractvia spec | 12.5/25 | The API declares no version and exposes no versioning scheme, so an agent can't pin to a stable contract across releases. Investigated: spec 50%, docs 0%. Fix: Set spec.info.version and adopt a versioning scheme so agents can pin to a stable contract. | A current OpenAPI version with a declared versioning scheme lets agents reason about the contract. |
| pass | Example coveragevia sdk | 10/10 | README is present and includes a runnable quickstart. Investigated: sdk 100%, spec 0%, docs 0%. | Examples carry shape semantics schemas under-specify — for humans and agents alike. |
| fail | Auth declared & discoverablevia spec | 0/25 | The spec declares no authentication scheme, so an agent can't tell how to authenticate a request. Investigated: spec 0%, docs 0%. Fix: Declare an authentication scheme and apply it globally or on every operation that requires credentials. | Agents can only call an API when they can determine its auth posture — a declared scheme, or an explicit statement that none is required. |
Developer ExperienceThe context both developers and agents need to integrate fast — onboarding, code samples, complete descriptions and worked examples0 pass0 warn5 fail40F
| Signal | Points | Findings | Rationale | |
|---|---|---|---|---|
| fail | Self-service developer portalvia docs | 0/29 | No self-service signup detected — no signup link on the homepage or docs, and no conventional signup path (/signup, /sign-up, /register, /get-started, /console/signup, /dashboard/signup, /try, /try-free, /free, /free-trial, /start, /start-free, /join, /create-account, /account/signup, /auth/signup, /users/sign_up) resolved — so an agent can't onboard on its own. Investigated: docs 0%. Fix: Publish a public signup endpoint and link it from your homepage/docs to compress time-to-first-call. | A first call without a human in the loop — self-serve credentials, a free tier, or an API that needs none. |
| fail | Quickstart presentvia docs | 0/25 | No quickstart or getting-started page found at the conventional docs paths, so new developers and agents have no obvious first step. Investigated: docs 0%. Fix: Publish a single-page quickstart that goes from zero to a first successful API call. | A quickstart is the fastest path from landing page to first successful call. |
| fail | Code samples in docsvia docs | 0/18 | No code samples detected across 1 sampled docs pages, so a coding agent gets no ready-to-use examples. Investigated: docs 0%. Fix: Add copy-pasteable code samples to API reference and quickstart pages. | Multi-language samples shorten time-to-first-call. |
| fail | Description completenessvia spec | 0/15 | Only 56% of operations and parameters have descriptions (62 of 78 ops, 22 of 69 params), leaving an agent to guess what most endpoints do. Investigated: spec 0%. Fix: Descriptions are the primary semantic signal agents use for tool selection. Each operation should explain what it does and reference its parameters; each parameter needs a real description. | Complete descriptions are the context humans and agents need to use endpoints. |
| fail | Changelog publishedvia spec | 0/13 | No changelog link or mention appears in the spec, so an agent can't tell what changed before something breaks. Investigated: spec 0%, docs 0%. Fix: Publish a structured changelog (e.g., /changelog.json or releases.atom) and reference it in info or externalDocs. | A published changelog lets partners track changes without surprise. |
Agent DiscoveryPartners and their agents can find your APIs — llms.txt, registries, crawlable and reachable docs2 pass1 warn1 fail71B
| Signal | Points | Findings | Rationale | |
|---|---|---|---|---|
| pass | Docs reachable, not hard auth-gatedvia docs | 30/30 | All 1 pages are publicly accessible. Investigated: docs 100%. | Agents can only index and fetch docs they can reach — past auth gates and over correct HTTP semantics. |
| pass | Registry & SDK presencevia docs | 28/28 | Indexed on Context7 (postmanlabs/httpbin, 388 snippets). Investigated: docs 100%, sdk 50%, cli 0%. | Listing in MCP registries and publishing SDKs puts the API where agents and their tooling look. |
| warn | Crawlable / AEOvia wellknown | 6/12 | No sitemap found via robots.txt or /sitemap.xml on the docs host, so AI search engines have no crawl map for your docs. Investigated: wellknown 50%. Fix: Publish an XML sitemap and reference it from robots.txt. | Bots allowed plus a fresh sitemap make docs findable by agent crawlers. |
| fail | llms.txt present, valid & comprehensivevia docs | 0/30 | No llms.txt found at any candidate location (https://httpbin.org/llms.txt, https://httpbin.org/docs/llms.txt). Investigated: docs 0%, sdk 0%. | A valid, comprehensive llms.txt is the machine-readable entry point for agents. |
Agent UnderstandingAgents can correctly interpret your APIs — machine-readable errors, consistent descriptions, structured data, parseable docs4 pass1 warn1 fail89A
| Signal | Points | Findings | Rationale | |
|---|---|---|---|---|
| pass | Machine-readable errors (RFC 9457)via spec | 28/28 | Documents 5 distinct 4xx/5xx error response codes, so an agent can branch on specific failures instead of guessing. Investigated: spec 100%, docs 100%. | RFC 9457 problem details and a documented error-code inventory let agents parse failures without burning tokens. |
| pass | Operation purpose clarityvia sdk | 25/25 | Surface uses a single dominant casing convention (snake_case). Investigated: sdk 100%, spec 0%. | Agents select the right endpoint from its summary + operationId; clear, named operations make tool-selection reliable — the strongest driver of correct tool choice. |
| pass | Agent-navigable, token-efficient docsvia docs | 22/22 | All 1 pages contain server-rendered content. Investigated: docs 100%. | Server-rendered, clean, small-footprint docs are what an agent can cheaply fetch and parse correctly. |
| pass | Description consistency across surfaces | 7/7 | Mean pairwise description similarity across 3 surfaces (spec, docs, sdk) is 40% (threshold 35% for full credit). | Every surface tells the same story about what the product is. |
| warn | Agent instructions file (AGENTS.md)via sdk | 5/10 | No agents.md or skill.md context file found (nice-to-have for agent operation). Investigated: sdk 50%, wellknown 0%. Fix: Add an agents.md or skill.md describing how an agent should use this SDK (auth setup, key operations, gotchas). | An AGENTS.md gives coding agents explicit setup, auth, and usage instructions to interpret and operate the API — beyond llms.txt's link index. |
| fail | Docs structured datavia docs | 0/8 | No JSON-LD or OpenGraph/meta tags found across 1 assessed pages (1 JS-rendered), so answer engines have nothing to cite. Investigated: docs 0%. Fix: Server-render structured data (JSON-LD) so AI answer engines can cite your docs. | Structured data (JSON-LD/schema.org) on docs pages gives agents an unambiguous parse target and is what answer engines cite. Detected on the JS-rendered head (Firecrawl) for a bounded page budget, so JS-injected JSON-LD is now caught; pages we can't render are excluded rather than failed. |
Agent UsabilityAgents have the context to use your APIs reliably, not just find them2 pass0 warn2 fail54D
| Signal | Points | Findings | Rationale | |
|---|---|---|---|---|
| pass | Sandbox separationvia sdk | 20/20 | Sandbox environments are exposed (sandbox). Investigated: sdk 100%, spec 0%, docs 0%. | An isolated environment lets agents exercise destructive operations safely. |
| pass | Runnable collection with test scriptsvia sdk | 9/9 | README is present and includes a runnable quickstart. Investigated: sdk 100%, platform 0%. | A public, maintained collection with assertions is runnable truth agents validate against. |
| fail | Idempotency documentedvia spec | 0/27 | Only 0% of mutating operations (0 of 25) document idempotency, so an agent's retries can create duplicate writes. Investigated: spec 0%, docs 0%, sdk 0%. Fix: Agents retry on failure; without idempotency, retries create duplicates. Document Idempotency-Key on every POST/PUT/PATCH/DELETE. | Documented idempotency lets agents retry safely. |
| fail | Rate-limit signalingvia spec | 0/22 | No rate-limit response headers are documented, so an agent can't tell when it is approaching a limit and will get throttled. Investigated: spec 0%, docs 0%. Fix: Add x-ratelimit-* response headers and document retry-after semantics. | Machine-readable rate-limit headers let agents throttle adaptively. |
| na | Pagination documented & consistent | —/22 | No surface produced evidence for this capability in this run. | Consistent, documented pagination lets agents traverse collections. |
Resources Discovered
The public resources we found for Httpbin — the evidence behind the score. All discovered from public sources; nothing here requires access to your systems.
| Agent hints | Context7 (388) |
|---|---|
| APIs analyzed | 1 — httpbin.org |