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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful context about what the comparison returns (score, best-for, lowest new price, used median, specs), but says nothing about failure behavior when a slug is unknown or about result ordering.

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 enumerating the returned dimensions with zero filler; every clause carries information an agent can use to decide whether to call it.

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?

There is no output schema, so listing the compared fields in the description is the right compensating move, and annotations cover safety. Minor gaps remain around slug validation and behavior on invalid input, but the definition is usable as-is.

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 reported at 0% for the parameter level, so the description carries some burden. It does add the meaningful 'two to five' cardinality constraint, but the crucial detail that slugs must come from search_pedals is supplied by the schema's item description, not the tool description.

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) and resource (pedals) and even enumerates the comparison dimensions returned (score, best-for, prices, specs), which clearly separates it from single-pedal tools like get_pedal. It stops short of naming a sibling explicitly, so it is clear but not fully differentiated.

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?

'Two to five pedals side by side' implies the batch-comparison use case versus get_pedal for a single pedal, but there is no explicit when-to-use, when-not-to-use, or prerequisite statement. Usage is only inferable from the phrase itself.

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