capcut_add_audio_fade

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

With no annotations, the description carries the behavioral burden. It clearly communicates that this is a mutating operation adding fades to an existing segment and why that is useful. However, it does not disclose whether existing fades are overwritten, how fade durations interact with segment length, or any other side effects.

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, front-loaded sentence states the action, resource, and benefit with no filler. 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 low-complexity editing tool, the description plus fully documented schema provides enough to invoke it correctly. The main missing context is edge-case behavior (e.g., fade longer than the segment) and explicit sibling routing, but these are not prerequisites for a basic call.

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 the input schema documents all four parameters and their defaults. The description adds no parameter-level detail, but it does not need to because the schema fully covers what each value means.

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 ('Adds'), a precise resource ('audio track segment'), and the concrete effect (volume fade-in/fade-out envelopes). This clearly separates it from siblings like capcut_add_audio_clip, which creates a segment, and capcut_add_sound_effect, which adds an effect.

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 phrase 'eliminating abrupt audio cutoffs in background music or dialogue' implies the intended use case, but the description gives no explicit when/when-not guidance or alternatives. An agent must infer that this tool is for adjusting an already-added audio segment rather than for adding or trimming audio.

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