estimate_video_bitrate

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

No annotations are present, so the description carries the full burden. 'Calculate' implies a pure, side-effect-free computation, and naming the three outputs adds useful disclosure, but it never confirms statelessness, error behavior for missing inputs, or output units/keys.

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?

A single front-loaded sentence with no filler; every clause corresponds to a real capability. It is dense to the point of being a run-on, which slightly hurts scannability but wastes nothing.

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?

There is no output schema, so the description must explain returns; it names the quantities but not the response shape or what is omitted/returned when optional inputs are absent. For a six-parameter calculator with zero annotations, one more clause on input requirements and output form would close the gap.

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 coverage is 100%, so the baseline is 3, but the description goes further by mapping parameter groups to specific computed results (duration+totalKbps→file size, targetBytes→max kbps, fps/width/height→bits-per-pixel). That linkage is meaning the schema does not provide on its own.

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?

Uses a specific verb ('Calculate') followed by three concrete outputs: encoded file size from duration and bitrate, target bitrate for a file-size cap, and bits-per-pixel density. An agent can immediately tell this is a video bitrate/size calculator rather than the aspect-ratio or tempo calculators among the siblings.

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 three described modes imply when each set of parameters is relevant (size from bitrate, kbps from targetBytes, density from fps/width/height), but the description never states this explicitly or says which inputs are required versus optional. No exclusions or alternative tools are named, though with these siblings little differentiation is needed.

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