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

With no annotations, the description must carry the behavioral burden. 'List' implies a safe read, and the note that results are slugs tells the agent something about the payload, but there is no mention of ordering, completeness, caching, or whether a fixed catalog is returned.

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, front-loaded with the verb and resource, with the useful slug detail in parentheses. No wasted wording; only the missing sibling reference keeps it from being ideal.

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 trivial zero-parameter listing tool with no annotations and no output schema, the description covers purpose and return element type (slugs). A slightly fuller note on the response shape would make it fully self-sufficient.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate beyond the schema's empty object. Baseline 4 for zero params is arguably met by the schema alone, but the description adds only the slug detail.

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?

Uses a specific verb and resource ('List the wine regions') and scopes it to what WildAlmonds covers. The parenthetical clarifies the payload is slugs, which distinguishes its role from sibling tools like get_winery or search_events, though it never explicitly names a sibling.

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?

The phrase '(slugs for other tools)' signals the intended workflow: call this first to discover valid region identifiers for other calls. It gives clear context but offers no explicit when-not-to-use or exclusion conditions.

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