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

Adds substantial context beyond the annotations: nothing changes until human approval in the browser (code + authenticator), approval executes exactly once and is recorded on Logs, the approval page shows the real effect read against Live, and a stale request is refused with no change. It also discloses the return shape (approval link + handle) and the polling handle. Fully consistent with readOnlyHint=false / idempotentHint=false / destructiveHint=false.

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 the core action in the first clause, then the approval mechanics. Dense but nearly every sentence carries a distinct operational fact; the 'Nothing changes until they approve; approving it carries it out' clause is mildly repetitive with the following sentence.

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 4-param, zero-required mutation gated by human approval with no output schema, the description covers what it does, who approves, what happens on approval, what happens on staleness, and exactly how the agent learns the outcome. Nothing an agent needs to call and follow up correctly is missing.

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 only 25% (note is the lone documented param), but the description compensates by naming all three payload parameters (account, support, news) and explaining they are local-part words for each email kind, with 'and/or' signalling they are optional/selective. It could still be clearer on expected format/validation of those word values.

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 specific verb+resource: asks the founder to set the local-part word each kind of email (account, support, news) sends from on the LIVE app's verified domain. It also names the sibling it is not (set_sender_words, which applies immediately pre-go-live), so an agent can distinguish it without opening another schema.

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?

Explicitly routes the alternative: 'Before go-live, set_sender_words changes it at once,' implying this approval-based path is for the live app. It also warns '*never* ask your human to tell you they approved' and points at live_action_status with wait: true, which is real invocation guidance. It does not spell out an explicit 'do not use when...' case beyond the pre-go-live contrast.

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