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 usefully discloses cost (1 credit per call) and the output format (SVG), but says nothing about whether the result is returned inline, stored, or downloadable, nor about any auth or rate limits. The cost disclosure is genuine added value, but key behavioral facts are still missing.

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, front-loaded with the core action and format, followed by the cost constraint. Every clause earns its place with 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 simple two-parameter generation tool with no output schema and no annotations, the description covers the action, input flexibility, output format, and cost. The only real gap is the undocumented 'size' parameter and the delivery mechanism of the SVG.

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 0%, so the description must compensate. It adds real meaning for 'text' by clarifying it accepts a URL or arbitrary text, but the 'size' parameter (default 300, range 100-1000) is never mentioned, leaving half the parameters undocumented.

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 (Create) and resource (QR code), plus the output format (SVG) and accepted inputs (URL or any text). This is unambiguous and distinguishable from all siblings, none of which generate QR codes.

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 examples (menus, payments, business cards) imply usage contexts but give no explicit when-to-use rule, prerequisites, or alternatives. With no competing sibling QR tool the routing risk is low, but the guidance is only implied rather than stated.

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