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

Beyond the annotations (readOnly, idempotent, non-destructive, closed-world), the description adds two genuinely useful behaviors: the clip may still be rendering, and the returned download link expires in an hour, which tells the agent not to cache or reuse it. It does not cover error behavior for an invalid or deleted clip_id, so it stops short of full disclosure.

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?

It is one dense sentence that front-loads the return contract and spends every clause on a distinct field or constraint. It reads as a slight run-on with a trailing "plus" appendage, but nothing is redundant.

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 one required parameter and no output schema, the description correctly takes on the job of describing return values and does so field by field, including the volatile download link. The only omission is guidance for the still-rendering case (whether to poll this tool again), which would complete the picture.

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?

There is a single parameter at 100% schema description coverage, and the schema already says it is the clip_id from list_clips. The description adds no format, prefix, or sourcing detail beyond that, so 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 and resource ("Returns one clip") and then enumerates exactly what that record contains: title, description, hashtags, score, render status, source-video position, trim headroom, and a download link. The singular framing plus the field list makes the retrieval of a single detailed clip clearly distinct from list_clips.

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?

Usage is only implied: the wording and the schema note that clip_id comes from list_clips suggest the list-then-detail workflow, but the description never says when to call this instead of get_clip_stats or get_transcript for a given clip. No exclusions or prerequisites are stated.

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