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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), and the description adds genuinely useful behavior on top: an existing template is refused unless replace=true, and replacing it 'changes the look of everything rendered after'. That downstream-impact warning is exactly the kind of context annotations cannot convey. It does not describe the analyze mutation's reversibility or scope, keeping it below 5.

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?

Every sentence carries information, but the structure is cramped notes-style prose with awkward line breaks and no leading sentence stating the tool's overall purpose. The reader must reconstruct the two-action model from the body rather than getting it front-loaded, which is a genuine structural gap rather than mere length.

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 7-parameter, two-action tool with no output schema and no destructive annotations, the description covers the action semantics, ordering constraints, and the template-replacement consequence well. The remaining parameters (model, settings, editable_sections) are only covered by schema text, and there is no explanation of what analyze returns, but nothing critical to correct invocation is missing.

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 adds semantics the terse enum descriptions do not: it spells out what 'analyze' actually rewrites (art_style, narrative_style, director_style, text_style, 'replacing hand edits') and ties 'replace' to the user's intent ('true only when the user asked for a new image'). That is meaningful meaning beyond the schema labels.

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 names two specific actions and their effects: 'analyze' rewrites the four style fields, and 'template' renders one of the style's two template images. That is a concrete verb+resource statement an agent can act on. It never distinguishes itself from siblings like style_edit or style_read, so it stops 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?

Real sequencing guidance is given: finish both template images 'before any reference image', and run template once per type ('run once for each' appears in the schema). It also states the refusal condition and the replace escape hatch. It offers no routing guidance relative to style_edit/style_read alternatives, so it is clear context rather than full when/when-not coverage.

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