get_keyframe_image

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

Annotations already declare readOnlyHint=true and idempotentHint=true, which are consistent with the 'Return' operation. The description does not add extra behavioral context such as output format, error handling, or index bounds. Since annotations cover the safety profile, this is adequate but not enriched.

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 one concise sentence, front-loaded with the action and resource. No wasted words, and it covers the essential information.

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 simple two-parameter getter with read-only and idempotent annotations, the description is mostly complete. It states what is returned and how it is selected. It could mention the return format (e.g., URL or binary) but given the simplicity, this is a minor gap.

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 0%, but the description clarifies that 'index' selects the keyframe by its position. The role of 'report_id' is not explicitly explained, though its name is self-descriptive. This partially compensates for the lack of schema descriptions.

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 'Return a keyframe image for a report by its index' clearly states the action (return), the resource (keyframe image), and the selection method (by report and index). It distinguishes from sibling tools like get_video_gif and render by specifying 'keyframe image' and 'report' context.

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 this tool: when a specific keyframe image from a report is needed, identified by an index. However, it does not provide explicit guidance on when to choose this over alternatives like get_video_gif or get_report, nor does it mention any exclusions or prerequisites.

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