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

Beyond the annotations (destructiveHint=true, readOnlyHint=false), the description discloses genuinely useful traits: keys are never returned, deletion only happens on a mailed confirmation click, export returns everything held, and nothing is charged during the free beta. It does not, however, separate which of the seven actions are destructive (revoke_key/delete) from the read-only ones, leaving the single destructiveHint to cover an otherwise mixed tool.

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?

It is a single dense paragraph that front-loads the resource and then lists actions compactly; almost every clause carries information. The sentence is somewhat run-on with heavy parenthetical nesting, which slightly hurts scannability.

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 zero-required-parameter, multi-action account tool with no output schema, the description covers authentication (session handling, not-signed-in behavior), key handling, and the deletion confirmation flow, which are the main things an agent needs. Return-value detail is omitted, but with no output schema the description could say a bit more about what each action yields.

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 the schema baseline is 3, but the description adds real meaning on top: it establishes that 'status' is the default action (the schema default is null) and cross-references key_prefix to the values returned by action='keys' and confirm_email to the user's own email. The 'tier' parameter is not addressed, though the schema already explains it is unnecessary during the beta.

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 states the resource ('the signed-in account') and enumerates every supported action (status, plan, usage, keys, revoke_key, export, delete) with a short gloss of each, so an agent knows exactly what the tool does. It does not, however, differentiate itself from the sibling 'whoami', which likely overlaps with the 'status' 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?

Usage is spelled out per action, including the default (action='status'), the required companion argument for 'revoke_key' (key_prefix) and 'delete' (confirm_email), and what happens when the user is not signed in. No explicit when-not guidance or named alternative to the overlapping 'whoami' sibling is given, which keeps this below a 5.

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