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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds two traits not in the annotations: it is deterministic/'without a model' (no semantic ranking), and it is 'Free, no allowance' (cost implication). It does not discuss result volume or pagination behavior, which keeps it from a 5.

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: the first front-loads the use case and the filter axes, the second handles routing and cost. No filler, and the alternative is placed after the primary case rather than buried.

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 an output schema and full parameter documentation, the description only needs to cover purpose, routing and cost, and it does. The remaining gap is minor: nothing tells the agent that results are paginated via limit/offset or what the default ordering is, though the schema covers those fields.

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%, so q, sort, limit, offset, slices and category are all already documented, including the AND semantics of slices. The description restates the phrase/category/slice grouping but adds no syntax or format detail, and it never mentions sort, limit or offset. Baseline 3 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 gives a specific verb (filter) and resource (the INITE Atlas) plus the exact filter axes: a phrase, a category, and slices. That is enough to tell it apart from match_tools. It stops short of 5 because the resource is referred to as 'the INITE Atlas' rather than explicitly as the tools catalogue, so a reader leans on the title to know what is being searched.

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 states the positive precondition ('when you know the shelf or the properties a tool must have') and the exclusion ('For a job described in prose, use match_tools'), naming the alternative sibling directly. An agent can route between the two without opening either schema.

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