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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds only that results are scoped to a single catalog and that each atom carries a type and short description; it says nothing about volume, pagination, or failure behavior for an unknown slug.

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 with the return content in parentheses and the motivation last — nothing is wasted. It is slightly too terse to stand alone, but there is no filler or redundancy.

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 single-parameter read with full schema coverage, an output schema, and rich annotations, the description covers purpose and payload adequately. The one meaningful gap is the absence of any pointer to get_atom_schema for per-atom detail, which would have made the discovery workflow complete.

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?

There is one required parameter at 100% schema description coverage, and the schema already explains it accepts a catalog slug or catalogId URI. The description's phrase "one catalog's" reinforces that a single catalog is addressed but adds no format, resolution, or error semantics beyond the schema.

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 gives a specific verb and resource ("Return one catalog's atoms") and clarifies the payload ("type + one-line description"). It is clear on its own, but it never names or distinguishes itself from near-neighbors like get_atom_schema or list_catalogs, so sibling separation is left implicit.

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 trailing clause "so you know its vocabulary" implies the use case: fetch a catalog to learn what terms it defines. There is no explicit when-not guidance, no mention of prerequisites, and no routing to get_atom_schema for drilling into a single atom, so the agent must infer the workflow.

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