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

Annotations already state readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered. The description adds genuine value by enumerating what the result contains (postcard, phone call, SMS, email), a read-only enumeration per location, which complements the annotation set.

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 tight sentence with the resource stated first and the example values trailing; no filler. Loses a point only for being a bare noun phrase rather than a leading verb (e.g., 'List...').

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 read-only, two-parameter tool with full schema coverage and helpful annotations, the definition covers scope and returned values adequately. The only gap is the absence of any when-to-use or sibling routing, which would be nice but is not strictly required here.

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 100%, so both accountId (with a pointer to list_accounts) and locationId are already fully documented. The description's phrase 'for this location' loosely echoes locationId but adds no format or syntax detail beyond the schema, so the baseline 3 applies.

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 identifies the resource (Google's allowed verification methods for a location) and gives concrete examples (postcard, phone call, SMS, email), so an agent knows what comes back. It does not explicitly distinguish itself from close siblings like get_gbp_verification_status or start_gbp_verification, which keeps it below a 5.

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?

There is no when-to-use guidance and no routing to alternatives, even though siblings such as get_gbp_verification_status (check status) and start_gbp_verification (begin a method) share the same space. The agent must infer that this tool is the read-the-options step.

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