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

Annotations already declare readOnly, idempotent, closed-world behavior, and the description adds meaningful context beyond them: results are metadata only with no file contents, and include SHA-256 fingerprints and scan grades. It does not mention pagination or how result ordering works, but the key behavioral expectation is set.

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 tight sentences with zero filler; the search scope is front-loaded and the return-shape caveat follows immediately.

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, the description usefully characterizes the return payload (metadata, fingerprints, grades), which is the right call. However, given 0% schema coverage on four parameters, an agent gets no guidance on how query, limit, or collection shape results — a notable gap for a search tool.

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%, so the description carries the full burden for four parameters, yet it only gestures at 'kind' via 'skills and configs'. The query text, limit cap of 25, and the collection enum are never explained in the description.

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 (free, public Foo Guard Library skills and configs), so an agent knows exactly what this retrieves. It does not explicitly contrast with the sibling get_library_item, leaving that distinction to be inferred from the verb.

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 description implies browsing/searching the public catalog when you don't already have a specific item, and 'free, public' scopes the corpus. It never names get_library_item as the alternative for retrieving a known item, nor states when not to use this tool.

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