gatefare.list_categories

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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint. The description adds value by stating the result includes API counts per category and that the operation covers all categories. It does not discuss pagination or return shape, but for a zero-parameter catalog list this is a minor gap.

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?

A single, front-loaded sentence states exactly what the tool returns without filler. Every word earns its place, and the key scope ('all available') and the useful detail ('with API counts') are included.

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?

For a simple, zero-parameter, read-only list operation with no output schema, the description is complete enough for an agent to call and interpret the result. It clearly says what is returned (categories with API counts) and implies an unfiltered catalog-wide response.

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 no parameters, so the schema covers all possible inputs at 100%. The description adds no parameter-specific detail needed to invoke the tool correctly, and the baseline for a zero-parameter tool 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 uses a specific verb ('List') and a specific resource ('all available API categories in the Gatefare catalog'), adding the detail that API counts are included. This clearly distinguishes it from sibling tools like search_apis or get_api without needing to open the schema.

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 implies the tool is for broad catalog enumeration, making it a reasonable precursor to searching or retrieving specific APIs. However, it does not explicitly state when to choose this over siblings or mention any exclusions, leaving usage context somewhat implicit.

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