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

With no annotations, the description carries the full behavioral burden. It discloses one genuinely useful trait, 'Free' (no cost/credit consumption), but offers nothing about permissions, read-only nature, rate limits, or freshness guarantees. The 'last update time' phrase largely restates return data already covered by the output schema, so real added behavioral context is thin.

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 with 'Free' front-loaded as the most decision-relevant token. No filler, though the flat comma list of returned fields is unprioritized and partially duplicates the output 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 zero-parameter info tool with an output schema, the description is minimally sufficient: it flags cost and names the data categories. It falls short by not explaining the practical use case (e.g., verifying that permit data exists for a city before issuing a search), which is the main thing an agent would need to route to it correctly.

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 and schema coverage is 100%, so there is nothing for the description to clarify. Baseline for a parameterless tool applies, since parameter semantics are not a meaningful axis here.

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 enumerates what the tool surfaces (cities covered, permit counts, date range, last update time), which lets an agent infer it is a metadata/coverage lookup. However, it reads as a bare noun list with no verb or explicit statement of what the tool does, and it never distinguishes itself from siblings like search_permits or sample_permits. Purpose is implied rather than stated.

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?

'Free' hints that calling it is cheap, which loosely implies it can be called early or speculatively, but there is no explicit when-to-use guidance and no mention of the alternative tools. An agent gets no instruction on whether to check coverage before calling search_permits or get_permit.

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