Blur / pixelate region

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

No annotations are provided, so the description must carry the burden. It explains the obscuring action and optional time range, but does not mention output behavior (e.g., whether it overwrites files), time format specifics, or any side effects. This leaves significant gaps for a video-editing tool.

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?

Single, well-structured sentence that front-loads the action and purpose with an optional clause for time range. Every word earns its place; no fluff 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?

With 10 parameters and no output schema, the description is concise but thin on operational details. It doesn't explain time format expectations (start/end accept string or number) or what happens to output_path. The core function is clear enough for basic use, but edge cases and output semantics are unaddressed.

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?

Input schema covers 100% of parameters with descriptions, so baseline is 3. Description adds little beyond schema: 'rectangle' maps to x/y/width/height, 'blur or pixelate' maps to mode, and 'time range' maps to start/end. No additional syntax or edge-case meaning is provided.

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?

Description states a specific verb ('Blur or pixelate') and resource ('rectangle of the frame') with a clear purpose ('hiding faces, license plates, names, or other sensitive content'). It distinguishes itself from sibling tools like draw_box or crop_video by focusing on obscuring content.

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?

Provides clear context on when to use: 'for hiding faces, license plates, names, or other sensitive content' and mentions optional time limiting. Does not explicitly name alternatives or exclusions, so not a 5, but it gives enough situational guidance.

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