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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the concrete API route (GET /category/{id}.json), which is mild context, but says nothing about 404 behavior or response shape; with no output schema, a bit more disclosure would have helped.

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 short sentences, front-loaded with the action; the API route line is mildly redundant with the name but harmless and quick to scan.

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 single-parameter read tool with full schema coverage and a readOnlyHint annotation, this is essentially complete. Only error behavior remains unaddressed, which is a minor gap.

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% and the id parameter is documented as a Mongo-style hex string, so the schema carries the load. The description adds no format or constraint detail beyond restating that the lookup is by id – baseline 3.

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 and resource ("Fetch a single category by id") plus the underlying endpoint, so the agent knows exactly what it returns. The 'single' vs the sibling knowledgeowl_list_categories is implicit rather than called out, so it stops just short of a 5.

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?

Usage is implied by "by id" and the get-vs-list sibling naming, but the description never explicitly says when to use this instead of knowledgeowl_list_categories or knowledgeowl_update_category, nor what happens with an unknown id.

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