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

The idempotentHint annotation covers repeat-call safety, and the description adds genuinely non-obvious behavior: an email is sent, and the response is deliberately identical whether or not order and email match (anti-enumeration). It does not disclose rate limits, permissions, or whether an email is actually dispatched on a mismatch, but the privacy guarantee is real added value.

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?

Two tight sentences, action front-loaded and the privacy property second. No filler, nothing repeated from the schema.

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 no output schema, the description should say what the caller gets back; it only says 'the answer is the same' without describing that answer or whether an email is sent when the match fails. Adequate for calling it, but incomplete on response behavior.

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 both parameters are already documented. The description only lightly reinforces that email must be the address the order was placed with and that it is checked against order_id; the baseline 3 applies.

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 and resource ('Emails the customer fresh pay and status links for an order') with enough specificity to separate it from siblings like get_order_status or send_document. An agent can tell immediately that this is a link-recovery action, not a status read.

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?

The description implies the trigger (a customer needs their pay/status links again) but never states when to use this versus get_order_status or how to handle a customer who already has the links. No exclusions or alternative paths are named.

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