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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the useful provenance note that values come from the data sheets, but says nothing about behavior when a name/slug is unknown or how missing data points are represented.

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 short sentence with the key qualifier (data-sheet values) placed immediately after the main claim. No filler, though the parenthetical could arguably be folded in more cleanly.

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, read-only comparison tool with full annotation coverage and full schema coverage, the description supplies enough to call it correctly and even hints at the return content (side-by-side technical data). Only edge-case behavior for unmatched products is left unstated.

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 both parameters (a, b) are already documented as product name or slug from "produkte". The description adds no further meaning about ordering, matching tolerance, or whether the two inputs must differ, so the baseline of 3 applies.

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?

"Side-by-side technical data of two products" states a specific action and resource, and matches the title "Compare two products". It is clearly distinguishable from the data-retrieval siblings (produkt/produkte) because it explicitly takes two products and compares them, though it does not name those siblings directly.

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?

Usage is only implied: an agent can infer this is the tool for comparing two items rather than looking up one. There is no explicit when-to-use/when-not-to-use statement and no mention of what to do if only one product is of interest (e.g. use produkt instead).

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