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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, non-destructive), and the description adds context about dataset scale, open licensing, and the fields returned. It does not disclose pagination/default limits or the by_dist/sort incompatibility, though those are carried by the schema; no contradiction exists.

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?

Three sentences cover resource, filters, and return payload with no filler. The parenthetical repeats 'Open Brewery DB' and adds licensing detail that is useful but slightly redundant with the opening sentence, preventing a perfect score.

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 list/filter tool with an output schema, 100% parameter coverage in the schema, and strong annotations, the description is largely complete. It could be improved by routing to the search sibling for free-text/name queries and by signaling pagination defaults, but those are discoverable in the structured fields.

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 the input schema already documents every parameter. The description adds a useful high-level list of common filters, but it does not deepen understanding of semantics such as by_dist's coordinate format or by_postal's 5-digit/zip+4 rule beyond what the schema states.

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 names a specific resource (Open Brewery DB directory) and action (browse/filter), and lists both filter dimensions and returned fields, so an agent can tell what the tool does. It stops short of 5 because it does not explicitly differentiate this tool from the sibling openbrewery.breweries.search, whose scope could overlap.

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 phrasing 'Browse ... directory' and 'Filter by city, state, country...' implies use when an agent wants a list or filtered list rather than a random brewery, but it never states a when-to-use rule or names alternatives such as openbrewery.breweries.search for name-based keyword lookups. It provides usable context without explicit exclusions or sibling routing.

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