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

Annotations already declare destructiveHint=true and idempotentHint=true, and the description corroborates this with 'overwrites ... with the values given'. More importantly it discloses non-obvious behavior annotations cannot: editing does not re-render the video, so a hook change only takes effect in the file after a new render. That is real added value beyond structured fields.

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 tight sentences, zero filler, and the operative fact (what gets overwritten) is front-loaded before the caveat about rendering. Every clause earns its place.

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 explained, and annotations carry the safety profile. The description covers the main gotcha (no re-render), but omits what happens to fields not supplied and any permission/lock requirements for editing a clip.

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 80%, so the schema already documents most parameters (title, hashtags 'without the # sign', hookText, description). The description only restates those field names as a group and adds the render caveat for the hook; it does not clarify whether omitted fields are left untouched or cleared. Baseline 3 is appropriate.

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 names a specific verb (overwrites) and enumerates the exact editable fields (title, description, hashtags, hook) on a clip, so the agent can identify it as a metadata-mutation tool. It stops short of explicitly contrasting with siblings such as get_clip or delete_clip, but the resource and operation are unambiguous.

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?

Usage is implied by the mutating verbs and the field list, but the description offers no explicit when-to-use guidance, no prerequisites (e.g. clip must already exist / be rendered), and no mention of alternatives if any exist. Nothing is misleading, but an agent must infer the calling context.

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