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

Annotations already indicate the tool is readonly, idempotent, and non-destructive. The description adds valuable behavioral context: it returns 'top-N most relevant tools with names, descriptions, and full input schemas' and states each result is 'ready to call directly, no second schema lookup needed.' This goes beyond what annotations provide.

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 concise (3 sentences) and front-loaded with the core purpose. Every sentence adds value: purpose, usage guidance, and return value. No redundancy or fluff.

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?

The description covers what the tool returns (names, descriptions, full schemas with examples) and its role as a first-step discovery tool. It does not detail ranking criteria or error handling, but for a discovery tool with good annotations, this is sufficient. Lacks mention of pagination or performance characteristics.

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 description coverage is 100% with all 6 parameters described. The description does not add significant new meaning beyond the schema, though it mentions 'curated examples' which are already present in the schema's examples field. Baseline 3 is appropriate.

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 'Find tools by describing the data or task.' It identifies the specific verb 'discover' and the resource 'tools,' distinguishing it from sibling tools like deep_research or search_news which perform actual research rather than listing available tools.

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?

The description explicitly says 'Use when you need to browse, search, look up, or discover what tools exist' and advises 'Call this FIRST when you have many tools available.' This provides clear context for when to use the tool, though it does not explicitly list alternatives or when not to use it.

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