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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds real behavioral context beyond that: a result cap of 10 and the fact that matches are returned with slugs and canonical URLs, which tells the agent the shape and breadth of what comes back.

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, no filler, with the search scope and the result cap both front-loaded. Every clause 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?

For a two-parameter, non-destructive search tool with an output schema present and safety fully covered by annotations, the description supplies what is needed: scope, result limit, and return shape. Not mentioning pagination or ranking order is a minor omission given the small fixed cap.

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% for both parameters, including the tools/repos/all enum and the 2-character minimum, so the schema does the heavy lifting and a baseline of 3 applies. The description's reference to the two catalogs loosely mirrors the 'type' enum but adds no syntax or default detail beyond what the schema already states.

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 ('full-text search') and both target resources (the AI tool directory and the repos/plugins catalog), which separates it from enumeration siblings like list_tools and list_repos and from the unrelated search_news. It does not explicitly name any sibling, so differentiation is inferred from the resource scope rather than stated.

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 only implied: an agent can infer this is the keyword-search entry point as opposed to browsing via list_* or fetching a single item via get_tool/get_repo. There is no explicit when-to-use, when-not-to-use, or fallback guidance, and no mention of how to handle zero results.

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