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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the useful domain nuance that muted applies to audio and hidden to video tracks, but it says nothing about what the preview default produces or what changes on each edit. The pointer to 'server instructions' is a hand-wave rather than disclosure.

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?

Two short sentences, front-loaded with the capability list, no padding. The second sentence is low-value since the output schema already covers the return value and the server-instructions pointer is vague, but the overall size is appropriate.

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?

An output schema exists so return values need not be spelled out, and annotations cover safety. Still, for a 7-parameter mutation with 29% schema coverage and no usage routing, the description should say more about required identifiers and the preview behavior.

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 only 29%, and the description names four of the seven parameters (name, muted, hidden, locked) with the audio/video qualifier that gives them extra meaning. However, it says nothing about track_id, timeline_id, or the preview enum, leaving a meaningful gap the schema only partly fills.

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?

Names concrete verbs on a specific resource: rename, mute (audio), hide (video), lock a track. That is far more informative than the title 'Set track' and lets an agent distinguish it from track.add and track.remove. It stops short of an explicit statement that only track attributes are modified, not the track's position or existence.

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?

No guidance on when to use this versus siblings like track.add, track.remove, timeline.set_sequence, or text.set. The only usage-adjacent text is 'Returns the edit result (see the server instructions)', which defers rather than instructs.

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