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

With no annotations, the description carries the full behavioral burden, yet it omits whether the operation is read-only, what permissions or api_key are needed, and whether it has side effects. It mentions similarity methods but no operational 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?

A single, front-loaded sentence that includes the key method options without waste. Every part earns its place.

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 4-parameter tool with no annotations and an output schema, the description covers the core purpose but leaves critical invocation details missing, such as the meaning of api_key and whether paths are file paths or identifiers. The output schema covers return values, but the input side remains partially undocumented.

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 0%, so the description must compensate. It lists the method options (correlation/euclidean/cosine) and implies path_a and path_b are the two spectra, but it never mentions the api_key parameter or path format.

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 (Compare), resource (UV-Vis spectra), and scope (for similarity), including method options. The 'UV-Vis' qualifier distinguishes it from other modality compare tools (e.g., covnmr_compare, covair_compare) in the sibling list.

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?

Provides no when-to-use or when-not-to-use guidance, nor does it name alternative tools for comparing spectra. It only restates the core action, so an agent must infer context.

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