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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds genuine context beyond them: it names the returned fields and enumerates the google_forms_access states (granted, missing, unknown), which tells the agent what a non-granted result looks like. It omits any mention of auth prerequisites or failure modes, keeping it below a 5.

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 sentence, front-loaded with the verb and the most important field (plan), with no filler. It is dense and slightly run-on — the trailing parenthetical enum list makes it a long read — but every clause carries information.

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?

There is no output schema, so the description must explain the return values, and it does so field by field for the four key items. It does not describe the response shape or how the plan value is formatted, which leaves a small gap for a zero-parameter tool with no annotations gaps elsewhere.

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, so the baseline is 4. The description correctly implies no arguments are needed and focuses entirely on the response, which is the right emphasis for a parameterless tool.

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 uses a specific verb ("Returns") and enumerates the exact fields of the account status resource: plan, max questions per form, Google link state, and Forms creation access. An agent can tell it is a read of the caller's own account. It does not distinguish itself from siblings like get_profile or get_capabilities, which appear to overlap in scope, so it stops short of 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?

No explicit when-to-use or when-not-to-use guidance is given, and the overlapping siblings (get_profile, get_capabilities) are never mentioned. Usage is only implied by the content — e.g. checking plan limits before building a form. That is adequate but leaves the agent to infer routing.

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