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

No annotations are provided, so the description carries the full burden. It does disclose return-shape behavior well (composited image, checkerboard, 8px grid, rulers, onion skin in red/blue) and implies a 16-frame cap, but says nothing about whether it is read-only, whether it writes files, or what happens with large scale/frame counts.

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?

Dense but every clause carries information, and the rendering description is front-loaded before parameter details. The line breaks inside sentences make it slightly harder to scan than necessary, but there is no filler.

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 9-parameter tool with no annotations and no output schema, the description covers the visual result and four key parameters adequately. The required path, scale, and layers remain unexplained, and side-effect/read-only behavior is unstated, leaving meaningful gaps for an agent to guess at.

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?

With 0% schema coverage across 9 parameters, the description has to do all the work. It explains the non-obvious ones well — frames accepts 1-based lists, "all", or ranges like "2-6"; region is [x,y,w,h]; mode is color/value/silhouette; onion=true. But the required `path` parameter, plus grid, scale, layers, and rulers, are left undocumented, so half the surface is still opaque.

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 opens with a concrete verb+resource ("Look at frames") and immediately specifies the rendered output: one image, up to 16 frames side by side, with checkerboard, grid, rulers, and per-frame labels. It never names the artifact type (sprite/animation file) or explains what `path` points to, and it doesn't distinguish itself from siblings like read_pixels or sprite_info, 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?

Usage is only implied through the mode definitions (e.g. value mode framed as "do the forms read without hue?"), which hints at intent but gives no explicit when-to-use vs. read_pixels, compare, or sprite_info. There are no stated exclusions or prerequisites, so the agent must infer when this visual-check tool is the right choice.

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