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

Goes well beyond the annotations by disclosing the return shape (matching tools with what each does plus a link), the zero-cost/no-signup property, and critically that this tool performs no editing itself — the user must open the link in a browser. Annotations already cover read-only/idempotent safety, so this adds real context. It stops short of saying what happens when no tool matches.

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 sentences, front-loaded with the core action, with the task enumeration and the "does not edit images" caveat placed after. The long example list is dense but each item maps to a real task the matcher accepts, so it earns its space.

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?

With no output schema, the description takes on the burden of describing results and does so (matching tools, their purpose, an open link). It also preempts the most likely agent misuse — assuming this tool performs the edit. Nothing needed to invoke it correctly 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% and the task param already includes example values, so the description adds little parameter-level meaning. The language parameter with its 40-value enum is documented in schema but never mentioned in the description, though the schema handles it adequately.

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 ("Finds") and a specific resource ("free ImgVX AI browser tool") scoped to a described image task, and enumerates the task space (background removal, upscaling, compression, format conversion). This distinguishes it from list_image_tools, which by name enumerates rather than matches a described task.

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?

Establishes the triggering condition ("for an image task the user describes") and gives concrete example phrasings that map to the task parameter. It does not explicitly name list_image_tools or get_pricing as alternatives, but the usage boundary is clear enough to select correctly.

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