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

All annotations are false, providing no positive safety or behavioral profile. The description only restates the action ('Place an audio asset onto...') without disclosing side effects, prerequisites, error conditions, or whether the operation is additive, even though destructiveHint=false suggests it is not destructive. For a mutation tool, this is minimal behavioral disclosure, with the description doing little beyond the annotations.

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 that efficiently states the action, resource, destination, and purpose. It contains no filler or redundant information and is appropriately succinct for a relatively simple tool, though it could have incorporated a bit more behavioral/usage detail without becoming bloated.

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 8 parameters, an output schema, and all-false annotations, the one-line description is thin but sufficient when combined with the complete schema. It does not provide usage alternatives, side-effect context, or when-to-use guidance, so while it is minimally viable, an agent selecting among many timeline tools would need to rely on the schema and tool name to make the right 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 all 8 parameters (projectId, assetId, startSeconds, durationSeconds, volume, loop, fadeInSeconds, fadeOutSeconds) are already documented in the schema. The description adds only a hint about 'timestamp' (matching startSeconds) and the purpose, but does not meaningfully supplement the schema. The baseline of 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 uses a specific verb ('Place') and resource ('audio asset') with a clear destination ('BlitzReels project timeline') and timestamp, and identifies the use cases (voiceover, music, sound). It implicitly distinguishes from sibling tools like timeline_media_add by specifying audio, but it does not explicitly name or contrast with an alternative.

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 description implies when to use the tool—when placing an audio asset for voiceover, music, or sound—but provides no explicit guidance on when not to use it or how it compares to alternatives like timeline_media_add. There are no exclusionary statements or alternative tool mentions, so the agent must infer the usage context.

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