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

With no annotations, the description carries the full behavioral burden. 'Update' signals mutation, but the description does not explain partial-update semantics, required permissions, whether omitted fields are preserved, how volumeKeyframes interact with volume, or any side effects. It mainly restates editable categories already visible in the schema.

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 definition is a single front-loaded sentence with no filler or repetition. Every phrase maps to a meaningful editable aspect of the audio track.

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 16-parameter mutation tool with no annotations and no output schema, the one-sentence description is not complete enough. It omits required context behavior, partial update semantics, defaults, and the effect of operations like keyframe replacement or shot pinning.

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 100%, so each parameter already has its own description. The tool description adds only a grouped list of editable categories and no additional syntax, defaults, or constraints beyond what the schema provides. Baseline 3 is appropriate when the schema does the heavy lifting.

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 ('Update') and resource ('audio timeline track'), and enumerates editable aspects such as placement, trim, fades, volume, and keyframes. It is clearly distinct from add_audio_track and delete_audio_track, though it does not explicitly differentiate itself from update_overlay_track or other update siblings.

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?

There is no when-to-use or when-not guidance, no prerequisites, and no mention of alternatives such as add_audio_track or update_overlay_track. Usage is only implied by the verb and resource.

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