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AgentsTools A11y Preflight – Static Accessibility Checker
x402
AgentsTools A11y Preflight – Static Accessibility Checker is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Runs a static WCAG 2.2 accessibility check on a UI markup fragment (HTML, JSX, TSX, Vue, or Angular) and returns pass/caution/block verdicts with per-finding WCAG criterion, element, and line number.
Price / call$0.02
Success—
StatusUnknown
How this service works
Static accessibility (WCAG 2.2) check of a UI markup fragment for JSX, TSX, Vue, Angular or HTML. Detects missing image alt, unlabeled form controls, buttons and links with no accessible name, skipped heading levels, invalid ARIA, non-interactive click handlers, duplicate ids, positive tabindex and low static colour contrast. Returns a pass, caution or block verdict with per-finding WCAG criterion, element and line. Accessibility indicators, not a legal compliance guarantee.
Output
A structured response containing an overall verdict (pass, caution, or block) and a list of per-finding objects each specifying the WCAG criterion violated, the element involved, the line number in the submitted markup, and a description of the issue. Note: results are accessibility indicators, not a legal compliance guarantee.
Example use cases
PR gate for React component accessibility
“Before we merge this pull request, run a WCAG AA static accessibility check on the following JSX snippet and block the merge if you get a 'block' verdict — show me every finding with its WCAG criterion and line number.”
Design token contrast validation
“I have a Vue component that uses CSS variable names like --color-primary and --color-bg — here's the markup and here's my theme palette map. Check it for low-contrast issues at WCAG AA level using those token values.”
Angular template audit for missing ARIA labels
“Audit this Angular template for WCAG A conformance issues, specifically looking for unlabeled form controls, buttons with no accessible name, invalid ARIA attributes, and any skipped heading levels — give me a verdict and per-line findings.”
Technical details
Endpoint
POSThttps://api.agentstools.dev/a11y/preflightWhen to prefer
Choose this endpoint when you need a fast, cheap ($0.02/call) static accessibility pre-check integrated into a CI/CD pipeline, code review agent, or design-to-code workflow across JSX, TSX, Vue, Angular, or plain HTML. Prefer it over full browser-based audits (e.g. Axe, Lighthouse) when you want zero runtime dependency, instant feedback on a fragment rather than a full page, and structured machine-readable findings with WCAG criterion references that an agent can act on programmatically.
Side effects
- Malformed or non-parseable markup returns an error or empty findings
- Auto-detect framework may misidentify ambiguous markup — use the `framework` enum to force the correct parser
- Dynamic/runtime accessibility issues (e.g. focus management, live regions) are not detectable by static analysis
- Color contrast can only be checked for colors resolvable at static analysis time; CSS variables require a `palette` map to be supplied
- WCAG level defaults to AA if not specified — A-only checks require explicit `level` parameter
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| level | string | WCAG conformance level to check (default AA) |
| theme | object | Alias of palette |
| markup | string | The UI markup fragment or component to check |
| palette | object | Optional name-to-colour map for static contrast (e.g. CSS variables / theme tokens) |
| framework | string | Source framework (default auto-detect) |
Tags
x402
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