audible_category

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

With no annotations provided, the description carries the full burden. It discloses that this is credential-free public catalog data, implying no auth setup and low risk, and clarifies that only the node and its immediate children are returned. It doesn't cover error behavior or exact response structure, but for a simple fetch this is strong context.

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 sentences with no filler. The core verb and resource are front-loaded, the cost/scope rationale is compact, and the credential-free note is a single useful phrase. Every sentence contributes.

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 one-parameter lookup tool with no output schema, the description is nearly complete: it states what is returned, the data source, the cost advantage, and that no credentials are needed. The only gap is behavior on an invalid or missing id, which is a minor omission for such a simple tool.

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 input schema already describes id as 'Audible category id from GET /audible/categories' with 100% coverage. The tool description adds little beyond that — it references the same source endpoint. This meets the baseline for schema-covered parameters but doesn't add extra meaning like id format or examples.

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 starts with a specific verb and resource: 'Get one Audible category node.' It further specifies the return content ('and its immediate children by id') and explicitly distinguishes itself from the full-tree endpoint, making its scope unambiguous against the sibling tool audible_categories.

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 explicitly names the alternative (GET /audible/categories) and gives the precise condition for choosing this tool: 'cheaper ... when only one node is needed.' This gives an agent a clear decision rule without opening schemas.

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