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

The title and description both assert this is a dry run that creates nothing, while the annotations declare readOnlyHint=false and destructiveHint=true. That is a direct conflict about whether the call mutates state, which is the single most important fact for an agent deciding to invoke it.

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 tight sentences, front-loaded with the check performed and its outputs, closing with the usage cue. No filler, though the output enumeration is dense enough that it could be slightly trimmed.

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?

With no output schema declared, the description usefully previews what is reported back (unmatched values, closest codes, grey count, scale), so an agent knows what a successful call yields. The contradiction with the annotations about state mutation is the only real completeness gap.

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 67% and the nested schema already documents columns, rows, dateFormat, and the template identifier in detail. The description adds 'No key needed' (an auth note) and confirms the data/knobs are the same payload passed to create_from_template, but contributes little about the parameters themselves.

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 gives a specific verb+resource ('Matches every region value against the template's geography and reports...') and names concrete outputs: unmatched values with closest real codes, grey-region count, and the map scale. It is unmistakably distinct from create_from_template, which it names as the follow-up action.

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 states exactly when to reach for it ('Use it when unsure of the codes') and routes to the alternative explicitly ('then create_from_template with the same data and knobs'). The relationship between this tool and its sibling is fully specified.

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