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

No annotations exist, so the description carries the burden. It usefully discloses copy semantics, the 100 MB limit, browser processing, and credit/Day Pass constraints, but omits auth, privacy, and detailed processing behavior.

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 core conversion sentence is front-loaded and clear, but the rest is a long pricing/credits blurb with a stray double period and repeated plan details that go beyond invoking this tool.

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 input type, size cap, browser execution, credit implications, and post-save verification. It is adequate, though it could state where the saved output goes.

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, so there are no parameter semantics for the description to add. This meets the baseline for a no-parameter tool.

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?

Names the exact conversion (MOV to MP4) and adds a concrete size bound, so the operation is clear. It does not explicitly differentiate itself from the generic mio_video_converter or other format-specific converters, so not 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?

Provides credit/workspace prerequisites and a post-conversion check, but never states when to choose this over the generic video converter or other format converters. Usage is mostly implied by the format-specific name.

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