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

With no annotations, the description carries the full behavioral burden. It does disclose useful operational context — processing happens in the browser, it consumes more credits than the Document/Image/Scanner workspaces, Day Pass excludes it, and a one-time credit pack unlocks all credit-based workspaces — but it omits permissions, input prerequisites, and output/return behavior beyond a vague 'review the processed result'.

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 useful purpose statement is front-loaded, but the bulk of the description is pricing and credit-pack boilerplate that does not help an agent select or invoke the tool. Several sentences repeat the same credit/unlock information, violating the 'every sentence should earn its place' standard.

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 browser-based tool, the description gives enough to understand the core transformation and output format choices. However, with no output schema and no annotations, it should explain input source/file selection and what 'review the processed result' actually returns; the credit details are present but operational completeness is only adequate.

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 has zero parameters and the schema is empty, so the baseline is 4. The description mentions MP4 or Web Video output, but there are no structured parameters to clarify or compensate for.

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 first clause names a specific verb and resource — 'Color Grade Video' — and enumerates the adjustable properties (brightness, contrast, saturation, color balance), making the core function clear. It does not explicitly distinguish itself from close siblings such as mio_ai_video_enhancer or mio_video_hdr_to_sdr, so it falls short of a 5.

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 never states when to choose this tool over alternatives like video_enhancer or hdr_to_sdr. The remaining text discusses credits and pricing rather than selection guidance or prerequisites, leaving usage context inferred from the purpose alone.

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