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

Beyond the annotations, it discloses project scoping, the download-and-compare workflow, the default 'keep this moment dry' decision behavior, exact timeline placement, and source/license reporting. It does not address what happens if the call is repeated or whether placement overwrites an existing effect, which would be useful to know.

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 dense but every sentence adds information: scope, workflow, defaults, exceptions, and examples. It front-loads the project-scoping constraint and keeps the reader oriented, though the uppercase emphasis is slightly noisy in an otherwise well-structured definition.

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 6-parameter tool with no output schema, the description is fairly complete: it covers purpose, sourcing, placement, licensing, defaults, and result contents. It still omits explicit error behavior and exact return shape, so an agent must infer some handling from the schema and examples.

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?

With only 17% schema description coverage, the description carries most parameter meaning: gain_db defaults to -6, max_seconds to 15, allow_none=false is reserved for explicit user requests, and 'at' refers to an exact output-timeline second. It adds meaning via examples but leaves max_seconds' precise effect and allowable ranges undocumented.

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 states a specific verb and resource: it searches real Openverse/Freesound recordings, acoustically compares candidates, and places a match at an exact timeline position. The PROJECT-SCOPED note and concrete examples like 'add a cinematic whoosh at 3.2s' make its behavior unmistakable and distinguish it from related sfx sibling tools.

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?

It gives explicit use cases ('add a cinematic whoosh at 3.2s', 'put a shutter on this cut') and explains when to set allow_none=false (only when the user explicitly requires an effect). It does not explicitly contrast with nearby alternatives like add_sfx or audition_sfx_candidates, so some routing judgment remains.

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