itunes_set_track_start_finish

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

With no annotations provided, the description must disclose side effects, requirements, and result behavior, but it does not. It never states whether the offsets persist, if this modifies the file or only the current session, or what the function returns (e.g., success message). The only behavioral nuance (song fallback to currently playing track) is a small positive, but critical details like permissions, reversibility, and side effects on existing offsets are omitted. This mirrors the under-disclosed mutation pattern in update_drive.

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?

The description is exceptionally tight: one defining sentence and a clean three-item list. Every word adds value, and the structure (purpose first, then parameter details) allows quick scanning. No fluff, no redundancy.

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 simple setter with only three optional parameters, the description covers the essential semantics well, including the special case for song. However, because there is no output schema, the description could have mentioned return behavior (e.g., whether it echoes success) or noted side effects like overwriting prior offset values. These are minor gaps for such a straightforward tool, so the description is complete enough for standard use.

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?

Despite the reported 0% schema description coverage, the Args section explicitly explains each parameter's meaning and defaults: start is 'in seconds (0 for beginning)', finish is 'in seconds (0 for normal track end)', and song is 'Optional track title' with fallback to 'currently playing track'. This converts the bare schema (which only shows types and defaults) into actionable knowledge, fully compensating for any coverage gap.

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?

The description clearly states the specific action: 'Set custom playback start and/or finish time offsets (in seconds) for a track.' This uses a precise verb ('Set') and resource ('custom playback start/finish offsets'), and the qualifier 'playback' distinguishes it from metadata-editing tools like itunes_edit_track_metadata. It fully captures the tool's function without ambiguity.

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 provides no guidance on when to use this tool versus alternatives such as itunes_seek (for momentary position) or itunes_edit_track_metadata (for persistent track properties). There is no mention of prerequisites, typical scenarios, or exclusions. The usage context must be entirely inferred from the name and one-liner, which is inadequate for an agent navigating ~70 sibling tools.

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