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 structurally. The description adds value by disclosing the shape of the payload (description, ingredient, usage, warnings, price, availability), which is meaningful given there is no output schema. It does not say what happens for an unknown slug or how availability/price are formatted.

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 with the resource, the lookup key, and the return fields, and no filler. Every clause carries information an agent can act on.

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 enumerated field list does the work of describing the response, and the tool is simple (2 params, flat object). Remaining gaps are small: the language parameter is never mentioned and there is no statement about behavior for a nonexistent slug.

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 50%: the language parameter is documented in the schema (enum of values, default en), while slug carries only min/max length constraints. The description supplies the key semantic that slug is the product identifier, but says nothing about the language parameter or the accepted slug format, so it neither compensates for the gap nor exceeds the schema baseline.

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 and resource ('Full details of one product') and constrains the lookup key to 'slug'. It enumerates the returned fields, so an agent knows exactly what it gets. It does not name or distinguish itself from siblings like search_products or browse_category, which is the only thing separating it from a 5.

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?

'by its slug' implies a lookup workflow — an agent must already have a slug, presumably from search_products or browse_category — but that prerequisite and the choice against those siblings is left to inference. No when-not-to-use guidance is given.

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