list_categories

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds real behavioral value by disclosing where the values are consumed (submit_tool) and how mismatches are handled (categorySuggestions), which is not derivable from the annotations or the empty schema.

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?

Two compact sentences, front-loaded with the purpose and followed by the downstream usage instruction. Every clause carries information; nothing is padding.

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?

With no output schema, the description carries the burden of describing returns, and it does so ('valid category slugs'). Combined with the empty input schema and the usage routing, an agent has enough to call it correctly. It omits nothing critical, though a note on response shape or ordering would make it airtight.

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?

Zero parameters, so there is nothing to disambiguate; baseline is 4. The description correctly implies a no-argument call by not describing any 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?

States a specific verb (list) and resource (valid category slugs), and even cites the underlying endpoint GET /api/agent/categories. It names the sibling tool (submit_tool) that consumes the output, so an agent can distinguish it from the auth and submission tools without opening a 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?

Explicitly routes usage: feed the slugs into submit_tool, and put anything that doesn't match into categorySuggestions. That is clear when-and-how guidance. It stops short of stating the ordering constraint (call this before submit_tool) or what to do if the list is empty.

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