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

With no annotations, the description carries the full burden and discloses almost nothing: it does not say whether the original file is overwritten, whether output is a new file or URL, how aggressive the removal is, or whether processing is async. 'Hint for the AI cleaner' in the schema even suggests an LLM-driven, nondeterministic step, which the description never surfaces.

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 sentence that is front-loaded with the action and resource, with zero filler. Nothing is padded or restated from the tool name.

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 media-mutating tool with no annotations and no output schema, the description leaves critical gaps: return value/shape, whether sources are modified in place, and behavior when no silence is found. The rich schema covers inputs, but the agent still lacks enough to invoke confidently.

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%, with each of the four parameters documented in the schema (threshold dB default, URL vs base64 input, filename hint). The description adds no additional meaning about how these interact or which input form is preferred, so the baseline 3 applies.

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?

States a specific verb ('remove') and resource ('long silences / dead air') plus the intent ('tighten pacing'), so the transformation is unambiguous. It does not explicitly distinguish itself from siblings like cut_audio or clean_noise, which is the only thing keeping it from a 5.

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 'to tighten pacing' hints at intent but gives no conditions for use, no prerequisites, and no comparison to the closely related siblings cut_audio and clean_noise. An agent must guess which of these three trimming tools applies.

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