Make an insert clip

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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false. The description adds the output dimensions (1080x1920) and the sound-sync behavior, which is useful context beyond the annotations, but says nothing about permissions, rate limits, or what happens to source assets.

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?

A single dense sentence with no filler, and the output-format detail is saved for the clause after the colon. However, it is a run-on construction that is hard to parse front-to-back for such an input-rich tool.

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 7-parameter mutation tool with no output schema, the description is too thin: it omits the meaning of several params, gives no return expectations, and provides no usage boundaries. Only the output format and the post_edit hand-off are covered.

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 0%, so the description must carry all parameter meaning. It clarifies image, sound, videoStart ('video from videoStart'), and seconds parenthetically, but leaves video, soundStart, and soundEnd completely unexplained, dropping three of seven parameters.

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 conveys that this produces a 1080x1920 reaction-picture clip synced to a sound, and names the consuming tool (post_edit join). But it never states a clean verb+resource, and the phrasing ('reaction picture ... cut to when the sound lands') requires effort to parse. It is distinguishable from siblings only indirectly through the post_edit reference.

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 only routing hint is 'for post_edit join,' which implies a downstream step but does not say when to choose make_insert over alternatives like clip_video, stitch_video, or finish_video. No prerequisites or when-not conditions are given.

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