w3c-mcp

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the action ('List all specifications') but doesn't describe behavioral traits such as pagination, rate limits, authentication needs, or what the output looks like (e.g., format, structure). This leaves significant gaps for a tool that likely returns a list of data.

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

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

The description is a single, clear sentence with no wasted words. It is front-loaded with the core action ('List all specifications') and efficiently specifies the scope ('that have HTML element definitions available'), making it easy to parse and understand quickly.

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

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

Given the lack of annotations and output schema, the description is incomplete. It doesn't explain what the output contains (e.g., list of spec names, URLs, metadata) or any behavioral aspects like error handling. For a tool with no structured output documentation, this leaves the agent with insufficient context to use it effectively beyond the basic purpose.

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

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

The tool has 0 parameters, and the input schema has 100% description coverage (though empty). The description doesn't need to add parameter semantics, as there are none to document. A baseline of 4 is appropriate since no parameters exist, and the description doesn't introduce any confusion about inputs.

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

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

The description clearly states the verb ('List') and resource ('specifications that have HTML element definitions available'), making the purpose understandable. It distinguishes from some siblings like 'get_css_properties' or 'get_w3c_spec' by focusing on HTML element definitions, but doesn't explicitly differentiate from 'get_html_elements' or 'list_w3c_specs', which might overlap in scope.

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

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

No guidance is provided on when to use this tool versus alternatives like 'get_html_elements' or 'list_w3c_specs'. The description implies a context of listing specifications with HTML element definitions, but it lacks explicit when-to-use or when-not-to-use statements, leaving the agent to infer usage from the name and sibling tools.

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