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

Annotations already disclose readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavioral context beyond that: the project is written into the signed-in user's own account, the tool returns an openable link, and the SVG input must be full-quality Studio99 output. It omits auth/permission specifics and error behavior for rejected URLs.

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?

Three short sentences, front-loaded with the action and its destination, then the account scoping, then the input restriction. No filler or restated name/title content.

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, and the description compensates by stating the return value (a link that opens the project). Combined with full schema coverage, annotation safety hints, and the explicit input constraint, an agent has everything needed to call this correctly.

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 description coverage is 100%, so baseline is 3; the description earns above baseline by constraining svg_url ('full-quality Studio99 SVG URLs only', from an earlier generation result), which is a real selection constraint the agent must respect. The text, title, and language parameters gain no additional meaning beyond their 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?

States a specific verb (Creates) and resource (an editable project in the Studio99 design editor) plus the outcome (returns a link that opens it). This clearly distinguishes it from siblings generate_calligraphy and list_styles, which the agent can rule out without opening any schema.

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 description makes the context clear: it operates on an SVG from 'an earlier generation result' and accepts 'full-quality Studio99 SVG URLs only', implying it is used downstream of generation. It stops short of explicitly naming generate_calligraphy as the source or stating when not to use it, so it is contextual rather than fully prescriptive.

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