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. The description adds only that the data is a 'tracked national rent sample' – it does not disclose what metrics or time period are returned, how current the sample is, or whether a missing state yields an error or a national-only response.

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?

Two short sentences with the resource stated first and the optional parameter behavior second – nothing superfluous. Slightly more precision on 'tracked' would have cost nothing, but there is no wasted wording.

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 single optional-parameter read tool with annotations and no output schema, the definition is serviceable but leaves the return content undescribed – an agent cannot tell what figures a 'national summary' contains or over what period, which matters given the absence of an output schema.

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 0%, so the description must carry the load, and it does explain that the state parameter is optional and that supplying it triggers a state-vs-national comparison. The two-letter format is conveyed by the schema pattern, and the description supplies the semantics the schema lacks.

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?

Names a specific verb and resource: 'Read the tracked national rent sample,' with the added scope note that a state can be compared against it. It is clearly distinct in subject matter from most siblings, though it does not explicitly contrast itself with the closest alternative, get_market_stats.

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 'Optionally compare one state with the national sample' implies that supplying a state switches to comparison mode and that the call is valid without any argument. There is no explicit guidance on when to prefer this over get_market_stats or get_rent_history.

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