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 covered. The description adds real context beyond that: library size (75 items), the fact that results are MP3 URLs, and that the assets are free to use — all useful for deciding whether to call it.

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?

Front-loads the resource and its scope, then gives filtering and follow-up actions in two short sentences. The long parenthetical category enumeration is somewhat dense but is genuinely useful for judging coverage, so it largely earns its space.

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 carries the return-value burden and does so adequately by noting the results are MP3 URLs and describing the catalog's breadth. Only the result ordering/pagination behavior is left unstated.

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 the schema already documents both `search` and `category`. The description's "filter by category or by a word" mirrors those parameters without adding syntax, matching rules, or fallback behavior, so the baseline 3 applies.

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 (list) and resource (the Ignix sound effects library) and enumerates exactly what is in it — 75 MP3 SFX across seven named categories. This is clearly distinguishable from generate_sound_effect, which produces new audio rather than listing a fixed catalog.

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?

"Filter by category or by a word. Download the ones you use into the project" implies a browse-then-download workflow, but there is no explicit when-to-use guidance and no mention of the obvious alternative (generate_sound_effect) for cases where no library item fits.

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