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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds valuable behavioral context: the output is a zip file, auto-detection works by transparent gaps, and margin trims inside grid cells. These details go beyond the annotations and help an agent understand the tool's 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?

Two sentences with no fluff. The first sentence states the action and output; the second explains the two operational modes concisely. It is front-loaded and every word earns its place.

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?

The description, combined with the rich annotations and output schema, fully equips an agent to invoke the tool: it explains the key decision (grid vs. auto-detect), the output format (zip), and the margin option. No critical information is missing given the tool's complexity.

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. The description enriches the parameter meanings by explaining the relationship between rows/cols and uniform grid mode, and the auto-detect mode when omitted. It also gives purpose to 'margin' (trimming padding), adding value over the plain schema descriptions.

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 uses a specific verb ('Cut') and resource ('packed sprite sheet / texture atlas') and clearly states the output ('separate transparent PNGs, returned as a zip'). This clearly distinguishes it from sibling tools like make_badge, make_chart, etc., which serve entirely different purposes.

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?

It provides clear context on when to use the grid-based approach (provide rows/cols) versus auto-detection (omit them). It also explains the margin parameter for padding. While it does not explicitly compare to sibling tools, they are all unrelated so no exclusion is needed; the context is sufficiently clear.

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