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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description usefully adds the output format (JPEG) and that it is the raw file with no crop, grade or titles, but says nothing about rate limits or return payload details beyond format.

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 compact sentence with the output format and the no-crop/no-grade caveat front-loaded. The phrasing is slightly garbled but nothing is padded or 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?

For a read-only image-extraction tool with full schema coverage and complete annotations, the essential mechanics are present. The critical missing piece is disambiguation from view_frame/view_media, which leaves a real selection gap for the agent.

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 the four parameters (time, media, width, project) are fully documented in the schema. The description adds no parameter-level detail such as default width or frame-selection semantics, 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?

The description conveys a specific resource and output: a single frame of a library video (or image) returned as a JPEG, uncropped/ungraded/untitled. However, it is awkwardly phrased ('one frame ... at a time in the file') and does not distinguish this tool from the sibling view_frame, which an agent must choose between.

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 when-to-use guidance, no prerequisites, and no mention of the highly overlapping siblings view_frame and view_media. An agent has no basis from the description to pick view_media_frame over view_frame.

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