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

Beyond readOnlyHint/openWorldHint the description adds real behavioral context: no API key or cost, results sorted largest-first, and the shape of the return (place_id values). It does not say what happens when query is omitted (all three params are optional) or what the default limit is.

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 short sentences with zero filler; scope, ordering, cost/auth, and return type are all front-loaded and each sentence earns its place.

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 simple three-parameter read tool with no output schema, the description covers what the tool searches, how results are ordered, what they contain, and how they chain into siblings. Only the optional-parameter defaults (empty query, limit) are left unstated.

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 only 33% — only state ('Two-letter state') is documented — so the description must compensate. It does explain that query is a name and state narrows it, but the limit parameter and its default behavior are never addressed.

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 verb and resource ('Search U.S. cities, towns and CDPs'), scopes the geography, identifies the lookup keys (name and state), and states the ordering ('largest first'). It also distinguishes itself from place_profile and place_block_groups by positioning itself as the id-producing entry point.

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 gives a clear implicit use case and routes the agent downstream: the returned place_id values feed place_profile and place_block_groups. There is no explicit when-not-to-use or mention of alternative search paths, which keeps it just short of a 5.

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