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

The readOnlyHint annotation already communicates that this is a safe read, and the description adds useful detail about the return payload, including taste profile, rating breakdown, price range, and knowledge-base description. It does not disclose edge-case behavior such as what happens if neither parameter is provided or if a name matches multiple lines.

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 two compact sentences: the first defines the tool's scope and parameters, and the second summarizes what is returned. Every sentence adds value and there is no redundant restatement of the schema.

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 read-only lookup, the description, output schema, and readOnlyHint cover the common usage well. The main gap is that the schema marks zero required parameters, so an agent could call the tool without either line_id or name unless it infers the one-identifier precondition from the description.

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?

With 0% schema description coverage, the description must compensate, and it does add key semantics: line_id should come from search_cigars and name is an alternative identifier. It does not specify whether exactly one is required, which parameter wins if both are given, or how name matching behaves, so the compensation is partial.

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 opens with 'Full details for one cigar line' and lists the lookup keys (line_id or name), so the verb, resource, and scope are immediately clear. It distinguishes itself from search_cigars by promising a single item's full details rather than a search result 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?

It says the tool takes a line_id from search_cigars or a name, which implies a look-up-after-search workflow. It does not explicitly rule out siblings like similar_cigars or search_products, but the single-item-details framing gives enough contextual guidance.

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