gif_frame

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

No annotations are provided, so the description carries the full burden. 'Extract' suggests a read-only operation and the output format is disclosed, but the description does not mention error handling for invalid frame indices, whether the source is modified, or the exact return format (e.g., raw PNG bytes vs. file path). It adds some context beyond the schema but lacks depth.

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, concise sentence that front-loads the action. Every word contributes meaning, with no filler or repetition.

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 tool with two well-described parameters, the description is mostly complete. It states the operation and output format. However, it does not explicitly clarify whether the PNG is returned as binary data, base64, or written to a file, and there is no mention of error behavior. Since no output schema exists, this slight ambiguity prevents a perfect score.

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%: both 'path' and 'frame' are described with sufficient detail. The description does not add any additional parameter semantics, so a baseline score of 3 is appropriate.

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 ('Extract') and names the exact resource ('a single frame from a GIF') and output ('as a PNG image'). This clearly distinguishes it from sibling tools like gif_info and gif_frames_list, which likely retrieve metadata or list frames, not extract an image.

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 usage when you need a specific frame as a PNG, but it does not explicitly mention alternatives or when not to use this tool. There is no exclusions or comparison to gif_frames_list, leaving the agent to infer the appropriate context.

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