capcut_add_lower_third

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

No annotations are present, so the description bears the full burden of disclosing behavior. It mentions adding an overlay with animations but does not explain side effects on the draft, track insertion behavior, default animation, or whether changes require saving.

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 description is a single, front-loaded sentence with no filler. It communicates the core action and object efficiently, though the slash phrasing 'title badge / lower-third overlay' is slightly redundant.

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?

With 10 parameters, no annotations, and no output schema, one sentence is insufficient for an agent to call this tool confidently. The description omits prerequisites, expected effect on the timeline, return behavior, and how animations are chosen or applied.

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 90%, so most parameters are already documented. The description adds light context by labeling the overlay as a speaker name/title badge, which maps to title and subtitle, but it does not meaningfully extend the schema information.

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 uses a specific verb ('Add') and a concrete resource ('speaker name and title badge / lower-third overlay'), so the tool's purpose is clear. It is distinct enough from generic text tools, though it does not explicitly name or contrast with siblings like capcut_add_text.

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 explicit guidance on when to use this tool versus alternatives such as capcut_add_text or capcut_add_subtitles_batch. Usage must be inferred from the phrase 'lower-third overlay,' which is better than nothing but leaves selection ambiguity.

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