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

Annotations already declare readOnlyHint=true, so the safety profile is covered; the description adds value beyond that by disclosing the return shape (channel types) and the identifier format (e.g. email:3719031852) that downstream tool calls consume. No pagination or auth detail, but the disclosure of the cross-tool id contract is genuinely useful given there is no output schema.

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: purpose first, then the actionable id detail, then the raw API endpoint as a footnote. No filler and nothing redundant.

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 must convey what comes back, and it does name the channel types and the id format. It stops short of describing authorization requirements or pagination, but for a simple read-only list it covers what an agent needs to call and consume it.

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?

Zero parameters, so there are no parameter semantics to explain; baseline for a no-arg tool is 4.

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 ('List the alert recipients/channels on the account') and enumerates the channel types returned, which makes it immediately distinguishable from updown_add_recipient. An agent knows exactly what this returns without opening the 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?

Usage is implied rather than stated: it notes the `id` is what a check's `recipients` take, which hints this is a discovery step before configuring checks, but there is no explicit when/when-not or named alternative (e.g. versus updown_list_checks).

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