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test_html_string

Analyze HTML content for accessibility compliance with WCAG standards using the Axe-core API. Input HTML strings and optional tags to test for specific accessibility issues.

Instructions

Test an HTML string for accessibility issues

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
htmlYesHTML content to test
tagsNoOptional array of accessibility tags to test (e.g., "wcag2a", "wcag2aa", "wcag21a")
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. While 'Test' implies a read-only analysis operation, the description doesn't specify what happens during testing, what kind of output to expect, whether there are rate limits, or any other behavioral characteristics beyond the basic purpose.

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

Conciseness5/5

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

The description is a single, clear sentence that efficiently communicates the core purpose without any wasted words. It's appropriately sized for a tool with two parameters and gets straight to the point.

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?

For a testing tool with no annotations and no output schema, the description provides the basic purpose but lacks important context about what the testing entails, what results to expect, and how it differs from related tools. The 100% schema coverage helps, but more behavioral context would be beneficial.

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?

With 100% schema description coverage, the schema already documents both parameters thoroughly. The description adds no additional parameter information beyond what's in the schema, so it meets the baseline expectation but doesn't provide extra value.

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

Purpose4/5

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

The description clearly states the action ('Test') and resource ('HTML string for accessibility issues'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'test_accessibility' or 'check_aria_attributes', which appear to be related accessibility testing tools.

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

Usage Guidelines2/5

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

No guidance is provided about when to use this tool versus alternatives like 'test_accessibility' or the various 'check_' tools. The description only states what the tool does, not when it's appropriate or what distinguishes it from similar tools on the server.

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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