capcut_compound_clip

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

With no annotations, the description carries the full burden. It usefully discloses the dry-run-by-default behavior, but it does not say what the write path actually does to the timeline (merge vs keep segments), whether it is reversible, or what happens to overlapping/partially-inside segments – a meaningful gap for a mutation tool.

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, front-loaded with the core action, then the analogy, then the default behavior. 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?

For a mutation tool with no annotations and no output schema, the description covers purpose, range semantics, and the dry-run default, but omits the result of the write path and failure/prerequisite conditions (e.g. prior mention that CapCut must be closed lives only in the schema). Adequate but not complete.

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 coverage is 60%; start_s and end_s carry no schema description, but the description supplies their critical semantics ('segments that lie fully inside start_s..end_s') and notes the single-video-track scoping for the track parameter. This compensates well for the undocumented range params, though the track default is left to the schema.

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?

Specific verb+resource: 'Group the segments ... into a compound clip'. It scopes the operation to segments fully inside start_s..end_s on one video track, and the analogy to Option+G plus the bilingual name makes the intent unmistakable. No sibling tool does anything comparable, so it is clearly differentiable.

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 CapCut Option+G analogy and 'Dry-run by default' imply when and how to use it, but there is no explicit when-to-use vs alternatives, no prerequisites for the write path beyond the schema note, and no exclusions. Usage is implied rather than stated.

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