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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the description's only added content is the scope of the settings. Critically, with zero required parameters the description never says whether an omitted field is preserved or reset — the single most important behavioral fact for a destructive, non-idempotent mutation.

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 front-loaded sentence with no filler, hedging, or repetition of the title. Every word contributes to the stated scope.

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?

The schema fully documents both parameters and annotations cover the safety profile, so the description is adequate. But for an all-optional mutation flagged destructive, it leaves the partial-update contract and any account-level permission requirements unaddressed.

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% and the enum description for delay even clarifies the '+24 hours = next day 9:00 AM' semantics, so the schema carries the load. The description only paraphrases the two fields ('on or off', 'delay after purchase') without adding defaults, format, or interaction rules.

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 pair (turns on/off, sets delay) against a specific resource (default tracking emails), which is more than a restatement of the name. It does not, however, distinguish itself from the sibling read counterpart get_tracking_email_settings, nor from update_email_template.

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 only implied: an agent can infer this is the write side of tracking-email configuration. There is no explicit 'use this when…' statement and no pointer to get_tracking_email_settings for reading current values or to update_email_template for per-template edits.

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