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

With no annotations, the description carries the behavioral burden and adds useful context: supported input formats, a 500 MB limit, browser processing, credit consumption, and workspace access restrictions. It does not explicitly say whether the original file is preserved, though 'SDR MP4 copy' implies non-destructive conversion.

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 purpose is front-loaded, but the description includes a long credit/pricing paragraph and an awkward double period after 'SDR display'. Much of the pricing detail is relevant but could be tightened for an agent-facing tool definition.

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 zero-parameter tool with no output schema, the description covers what the tool does, input formats, size limits, output type, processing environment, and credit constraints. It does not explain how the resulting MP4 is delivered, but the core information needed to invoke it is present.

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?

The tool takes zero parameters, so the schema baseline is 4. The description appropriately focuses on input constraints and output type rather than inventing parameter semantics.

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 states a specific verb and resource: convert HDR video to an SDR MP4 copy. It clearly distinguishes this conversion from general video editing or color tools, but does not name any sibling alternative for comparison.

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?

It implies usage by saying to upload an MP4, MOV, MKV or WebM and then check highlights, color and playback on an SDR display. However, it does not explicitly state when to use this tool versus alternatives or any exclusions beyond the file-size limit.

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