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

Annotations already include readOnlyHint=true, so the description doesn't need to repeat that. It adds value by disclosing return content (categories, requiresScope, one-line descriptions, matched tags) and the 'free for all plans' aspect, which are beyond the annotations. No contradiction.

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 three sentences with no wasted words. The primary purpose is front-loaded, and each sentence contributes useful information: what it does, when to use it, and what it returns.

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 tool's simplicity, the description covers its purpose, usage context, and return values. It doesn't mention pagination or limits, but the output schema likely covers return structure. The 'free for all plans' note adds operational context. Overall, complete for an agent to call correctly.

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?

Schema coverage is 0%, so the description must compensate. It mentions the three search dimensions (query, category, intent) but doesn't elaborate on allowed values, formats, or interactions between them. It provides basic meaning beyond the schema, but not full compensation for the lack of schema descriptions.

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 it searches and filters the MCP tool catalog by query, category, or intent, distinguishing it from sibling tools like search_posts (which searches posts). The verb 'search and filter' with the resource 'tool catalog' is specific and unambiguous.

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?

It provides a clear when-to-use scenario: when many tools are available and you need to narrow down without scanning all descriptions. It doesn't explicitly name alternatives or say when not to use, but the context is clear enough for an agent to infer.

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