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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=true, idempotentHint=false). The description adds genuinely new behavioral context: the call is refused unless rights_confirmed is true, and the exact legal notice must be shown first. It does not, however, disclose what happens on repeat uploads of the same URL (non-idempotency), whether uploads are retained/deletable, or anything about failures — gaps an agent would care about for a write operation.

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 verb, formats, and size cap, and the alternative is placed last where it belongs. The embedded rights notice is long but is required content, not filler; the only blemish is the awkward splice "first tell the user By uploading... and get their OK," which slightly muddies sentence boundaries.

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 write tool with no output schema, the description covers the input source, the format/size constraints, the returned key, the downstream consumers, the consent gate, and the alternative path for local files. Nothing an agent needs in order to call it correctly is missing.

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 the baseline would be 3. The description goes beyond it by supplying the verbatim rights notice the agent must display before setting rights_confirmed=true, which is semantic instruction the schema only references. audio_url semantics largely restate the schema field 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 and resource ("Store the user's voice recording"), constrains the input form (public https link to MP3/WAV/M4A/OGG, up to 60s, 25 MB), and names the output artifact (audio_key) plus the two sibling tools that consume it. An agent can distinguish it from get_audio_upload_page and upload_reference_image without opening any schema.

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?

Explicitly routes the alternative case: "For a file on the user's device use get_audio_upload_page instead." It also names downstream tools (create_video_from_audio, set_scene_audio), so the agent knows both the entry condition and where the result goes.

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