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 useful context that 'each call still needs its own approval' and that it should be re-read after setup, but it doesn't elaborate on rate limits or failure modes beyond the annotation-provided facts.

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?

Front-loaded with 'Start here.' and limited to three tight sentences with no filler. The returned fields are enumerated efficiently. Minor room to trim, but every sentence carries signal.

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 zero parameters, an output schema (so return values needn't be explained), and annotations covering the safety profile, the description supplies the remaining context an agent needs: entry-point role, re-read timing, and the approval requirement for subsequent calls. Adequately complete.

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 per the rubric the baseline is 4. There is nothing parameter-wise for the description to clarify, and the schema is trivially complete.

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?

States a clear verb (returns) and enumerates the specific account resources: setup steps and link, credits, monthly limit and remaining, and the name/number used for calls. This makes the tool's output distinctive. It doesn't explicitly differentiate from siblings like read_settings or get_profile, but 'Start here' signals it as the entry-point status check.

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?

'Start here' and 'Read it again after the owner finishes setup' give clear timing guidance for when to call it. However, it never names or contrasts with alternatives such as read_settings or get_profile, so the agent must infer why to prefer this over them.

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