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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the output layout semantics (left-to-right, then down, with source times), but says nothing about defaults, whether the image is returned or written to disk/URL, or cost for large videos — notable gaps given there is no output schema.

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 dense sentence with zero filler, and the most distinguishing information (output shape) is front-loaded. It is a noun phrase rather than a verb-led statement, but nothing is wasted.

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 media-processing tool with 6 parameters, no output schema, and 50% schema coverage, the description omits how sampling is controlled (count vs every), what the defaults are, and how the resulting image is delivered. An agent could not confidently call this correctly from the description alone.

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 only 50%: 'count', 'columns', 'tileWidth' and 'project' are undocumented, and the description supplies no meaning for them — it never mentions tile count, per-tile interval, column count, or tile size. Only the tiling order ('left to right then down') loosely hints at 'columns', which is insufficient to compensate for the coverage gap.

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 the concrete artifact produced — evenly spaced video frames tiled into a single image with per-tile source times — which is far more specific than the bare name 'filmstrip'. It lacks an explicit verb and never distinguishes itself from the nearby sibling grab_frame (single frame), so an agent must infer the difference.

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?

There is no guidance on when to use this versus alternatives such as grab_frame, show_preview, or detect_scenes, and no stated prerequisites (e.g. whether the media must be in the current timeline project). The agent must infer the use case entirely from the output shape.

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