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

Annotations already declare readOnly, idempotent, non-destructive and non-open-world behavior, so the bar is low; the description still adds real context by noting the search is run 'locally, free of charge' and that results are ranked and paginated. It stops short of describing result shape or pagination mechanics, but it meaningfully enriches the annotation picture.

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?

Three short front-loaded sentences with no padding, which is structurally sound. However, the character-count sentence duplicates schema constraints and the category sentence is awkward enough to obscure rather than clarify, so not every sentence fully earns its place.

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 and 0% parameter coverage, the description should explain the four inputs and return behavior; it covers query length and vaguely mentions ranking and pagination but leaves limit, offset and category unexplained. Annotations fully carry the safety profile, so the gap is confined to parameter guidance.

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 0% across four parameters, so the description must carry the load. It restates the 2–200 character query bound (already enforced by minLength/maxLength) and alludes to pagination, but never explains limit or offset, and its category guidance is unintelligible, leaving half the parameters effectively undocumented.

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 (Search) and resource (live KeepBal tools and models), which is a clear operation an agent can identify. It is implicitly distinct from siblings like run_tool or inspect_tool, which act on a single known item, though the description never names those siblings to sharpen the boundary.

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?

There is no explicit when-to-use/when-not guidance relative to inspect_tool or run_tool. The line 'use category models for models' is the only routing hint and it is cryptic — it never states the parameter name or an exact value, so an agent must guess at intent.

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