generate_qr_code

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds valuable context beyond basic function: it specifies the return format ('base64-encoded PNG image') and cost ('FREE — no payment required'), which are not inferable from the input schema. However, it does not cover aspects like rate limits, error handling, or performance traits.

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 appropriately sized and front-loaded, with two concise sentences that directly convey the tool's function, output, and cost. Every sentence earns its place by providing essential information without redundancy or unnecessary details.

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?

Given the tool's moderate complexity (2 parameters, no output schema, no annotations), the description is mostly complete. It covers purpose, output format, and cost, but lacks details on error cases, usage limits, or example scenarios. With no output schema, it could benefit from more on return values, but the base64 PNG mention partially compensates.

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 the schema already documents both parameters ('data' and 'size') fully. The description adds minimal semantic value beyond the schema, as it only mentions 'text or URL' for 'data' and does not elaborate on 'size' or default behavior. Baseline 3 is appropriate when the schema handles parameter documentation effectively.

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 clearly states the tool's purpose with a specific verb ('Generate') and resource ('QR code image'), and distinguishes it from siblings by specifying the unique function of creating QR codes from text/URLs, which none of the sibling tools offer.

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 implies usage by stating 'Generate a QR code image from any text or URL,' but does not explicitly guide when to use this tool versus alternatives or provide exclusions. It mentions 'FREE — no payment required,' which hints at a cost-free context but lacks detailed comparative guidance.

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