get_video_gif

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

With no annotations, the description carries full responsibility. It reveals that parameters are 'clamped to safe ranges' and 'the GIF is cached on disk per parameter set,' offering useful behavioral insights. However, it does not mention permission requirements, side effects like cache eviction, or the nature of the return (binary vs. URL).

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 concise—three sentences—and front-loads the primary purpose. Every sentence adds value, with no redundant or filler content.

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 no output schema and 5 parameters, the description does not specify the return format (e.g., binary data, URL) or error handling. It covers caching behavior and parameter clamping, but leaves gaps in understanding the output and potential failure modes.

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%, so the description must compensate. It mentions that fps, width, start, and end are optional and clamped, but fails to explain their meaning (e.g., units for time parameters, default values for fps and width). Given 5 parameters with no schema descriptions, additional detail is needed for accurate invocation.

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 clearly states the tool's action ('Render an animated GIF preview of the video for a report') with a specific verb ('Render') and resource ('animated GIF preview of the video for a report'). It distinguishes itself from siblings like get_keyframe_image (static) and render_html_video (different format) by emphasizing animation and GIF format.

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 provides explicit use cases ('embedding a short looping preview in an issue, chat, or PR description') and notes that parameters are optional and clamped. However, it does not explicitly compare with sibling tools like analyze_video or get_keyframe_image, nor does it state when not to use this tool.

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