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

With annotations already flagging readOnly=false and destructive=false, the description still adds substantive behavior: it blocks ~10 seconds, returns best-first takes with per-take 120-day URLs that need no auth header, allows one concurrent job per account and 250/week, and discloses that takes are AI-generated and may be added to soundza's library (non-exclusive). That is unusually rich disclosure; only the failure/timeout behavior is unstated.

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-loaded with the highest-value facts: what it produces, how long it takes, and what comes back (url, preview_url, file_name, ready curl). Three paragraphs of dense but largely non-redundant content; the curl command template and example prompts are the only slightly bulky parts.

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?

There is no output schema, and the description fully compensates: it enumerates return fields, notes the WAV/MP3 pair and header-free access, gives a save command, and states link expiry. Combined with quota and licensing constraints, an agent has everything needed to invoke and use the result correctly.

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 coverage is 100%, so baseline is 3, but the description earns above baseline by teaching prompt authoring with concrete examples ('magic sparkle chime', 'retro 8-bit coin pickup') and reinforcing the duration ceiling. Seed and takes semantics remain schema-only, which caps it below 5.

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 concrete verb and resource — 'Make a new sound effect with AI from a text prompt' — and immediately bounds the artifact type (SFX/short ambience up to 10 seconds). It also differentiates from the sibling search_sounds by telling the agent to search the catalog first when an existing sound would do.

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?

Explicit when-to-use ('best for sound effects and short ambiences up to 10 seconds') and when-not ('not for music with structure or speech', 'for music beds or anything over 10 seconds'), plus a named alternative path: search the catalog first. Nothing about tool selection is left to inference.

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