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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false. The description adds cost information ($0.01 USDC via x402) which is beyond annotations and very useful for an agent deciding whether to call. It also notes 'Handles abbreviations, alternate spellings, and local variations' which gives insight into processing behavior. No contradiction.

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 with zero waste. The primary purpose is front-loaded. Cost information is useful and concise. Could have mentioned state explicitly but overall efficient.

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, idempotent tool with no output schema, the description covers purpose and cost. It doesn't mention return format or example output, but annotations and schema cover safety and parameters. Slightly incomplete for agent decision-making but adequate given the annotations.

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 100%, so parameters are documented. The description, however, doesn't add additional meaning beyond what the schema provides. It doesn't explain how 'state' helps or what 'algorithm' options exist, but schema has examples. Baseline 3 is appropriate.

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 clearly states the tool's purpose: standardizing city names to a canonical form. It mentions specific capabilities like handling abbreviations, alternate spellings, and local variations. However, it doesn't explicitly distinguish it from sibling tools like interzoid_country_standard or interzoid_org_standard, but those are different domains (country vs. organization), so the verb+resource+scope is clear enough.

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 description implies usage for cleaning city data but doesn't explicitly state when to use this over alternatives or when not to use it. It mentions cost, which is practical. No explicit exclusions or alternative routing.

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