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a11y-mcp-server

by aiuxmasters

Audit a local HTML file for accessibility issues

audit_file

Audit an HTML file for accessibility issues using axe-core rules. Specify a local file path and optional rule tags to detect WCAG violations.

Instructions

Same checks as audit_html, reading the document from a local file path.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesPath to a local .html file
tagsNoRestrict to specific axe-core tags, e.g. ["wcag2a", "wcag2aa"]. Omit to run all rules.
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It only states 'same checks as audit_html' without disclosing behavioral traits such as side effects, permissions needed, or safety. Since it reads a local file, it is likely non-destructive, but this is not confirmed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise with a single sentence. It is front-loaded and efficient, though it could provide more structured information. It earns its place but is slightly too terse.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple parameters and absence of an output schema, the description is minimally adequate. It relies heavily on knowledge of the sibling tool audit_html. The return format or behavior is not described, so completeness is moderate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and both parameters (path, tags) have clear descriptions. The tool description adds no additional meaning beyond what the schema already provides, so a baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states that the tool performs the same accessibility checks as audit_html but reads from a local file path. This differentiates it from its sibling tool and specifies the exact action and resource.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the description: use when you have a local HTML file. However, there is no explicit guidance on when not to use it or how it compares to audit_html for non-file contexts. The sibling tool is named but no exclusion criteria are provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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