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

The description adds substantial behavioral context beyond annotations: it explains the server downloads the file from download_url, that the result links expire after 1 hour, the storage/processing architecture (Cloudflare R2, headless browser), and that the input is deleted when the job ends. Annotations already declare it's not readOnly, not idempotent, not destructive. The description covers important lifecycle details (input deletion, link expiry) that annotations don't.

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?

Well-structured with clear sections: effect description, input requirements, optional settings, output info, and processing details. Front-loaded with the core effect. Slightly long but every sentence adds value.

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?

Complete for a complex audio processing tool with nested object parameters and no output schema. Covers input constraints, optional settings, output format, link expiry, storage, and deletion. Could better explain the settings object structure.

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. The description adds meaning by naming specific settings for set_8d_effect (secondsPerTurn, distance) and explaining outputFormat/bitrateKbps usage, but does not provide format syntax or defaults beyond what schema offers. Slightly better than baseline due to naming the settings object contents.

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 effect ('Pans the audio in a circle around the listener - the 8D audio effect') which is a distinct audio processing operation. Given the long list of siblings, it's clear this is a specialized panning effect tool, distinguishable from things like stereo_widener or reverb_adder.

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 usage context ('one file with a public HTTPS download_url') but does not explicitly state when to use this vs alternatives like stereo_widener or reverb_adder. No exclusions or alternatives are mentioned.

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