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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds two genuinely new facts: the analysis is offline and returned positions are in source-time seconds (a meaningful distinction in a timeline editor where timeline vs source time can differ). It says nothing about return shape or cost of analysis.

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 telegraphic fragments with zero filler, so nothing is wasted, but the lack of a verb makes it read like a search-index snippet rather than an instruction. The '(offline)' aside and 'Source seconds' floating fragment are under-structured for the value they carry.

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 read-only, closed-world tool with four well-documented parameters, the basics are covered. However, there is no output schema and the description never states what is returned (start/end pairs? per-track results?), leaving the agent to infer the response shape from the phrase 'Source seconds'.

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 minDuration (default 0.5s) and thresholdDb (default -30dB) are already fully documented in the schema. The description contributes only the 'Source seconds' unit note, which is marginal beyond what the schema provides; 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?

The description names a specific resource and scope: silent stretches within a media file's audio, with the parenthetical '(offline)' indicating the analysis is local rather than cloud-based. It is understandable apart from the name, though it never contrasts itself with adjacent tools like detect_scenes, measure_loudness or waveform_levels.

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 guidance on when to reach for this tool versus siblings such as measure_loudness (level analysis) or detect_scenes (visual analysis), nor any prerequisites or exclusions. 'Offline' is the only hint about context, and it is unexplained.

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