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

Annotations already declare readOnlyHint, openWorldHint=false, and idempotentHint, but the description adds valuable specifics: nothing is executed or stored, minified SVG plus before/after sizes are returned, and there is a 30 calls/min/IP rate limit. This exceeds what annotations alone convey.

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?

The description is two sentences: purpose first, then safety/output/rate limit. No wasted words; each clause provides distinct information.

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 simple 2-parameter tool with robust annotations and full schema coverage, the description covers purpose, safety, return value, and rate limiting. It could mention when to choose this over sibling tools, but that gap is captured in usage_guidelines; overall the tool is well-specified.

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%, with svg and preset each having descriptions and preset also having an enum with default. The description adds no parameter-specific semantics (e.g., preset behavior or input constraints), so it does not need to compensate; baseline 3 is appropriate.

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 'Optimize/clean SVG markup (SVGO)', a specific verb+resource pair that clearly identifies a markup optimization tool. This distinguishes it from siblings like svg_to_datauri (format conversion) and minify_code (general minification).

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 does not explicitly name alternatives or provide when-to-use/when-not-to-use guidance. 'Pure markup transformation — nothing is executed or stored' implies a safe-use context, but the agent must infer when optimize_svg is preferred over minify_code or svg_to_datauri.

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