upscale_fast

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 only states the 4x upscale action and does not disclose output behavior, file handling, potential side effects, or what 'fast' implies. This is insufficient for a tool with zero annotation context.

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 a single, front-loaded sentence with zero wasted words, efficiently conveying the core action. It earns its place without unnecessary elaboration.

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?

Despite being a simple tool, the absence of annotations and output schema means the description should explain return values or output behavior. It only states the upscale factor, omitting what the tool returns or where the output goes, leaving the agent to guess from parameter names.

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%, with each parameter having a basic description (image_path, filename, output_dir). The tool description adds no parameter-level meaning beyond what the schema already provides, so the baseline score of 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 'Upscale image resolution by 4x.' clearly states the tool's function with a specific verb and resource, plus the upscale factor. However, it does not explicitly differentiate itself from the sibling tool 'upscale_creative', leaving the distinction between 'fast' and 'creative' upscaling implicit.

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 provides no guidance on when to use this tool versus alternatives such as 'upscale_creative' or other siblings. There is no mention of context, prerequisites, or exclusions, so the agent receives no usage direction beyond the tool's name.

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