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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, and the description adds real value beyond them: the required scope and the semantics of an empty result (all alerts fall back to built-in defaults). It does not cover error behavior for an unknown monitor id, keeping it below a 5.

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?

Three dense sentences with no filler; the key enumeration is long but load-bearing because it defines what the returned map can contain. The auth prerequisite is front-loaded ahead of the purpose statement, a minor ordering inefficiency.

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 appropriately supplies the return shape, the valid key set, and the empty-result interpretation, plus the scope requirement. Nothing an agent needs to call and interpret this tool 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 100% and the single parameter (id: Monitor UUID) is fully documented in the schema. The description adds no further meaning about the identifier, so 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 ('Gets a monitor's custom alert message templates') and immediately characterizes the return value as a map of event-type keys to template strings. It is clearly the read counterpart to the sibling set_alert_template without needing to name it.

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 access prerequisite ('Requires the read scope or higher') is stated, which helps gate usage, but there is no explicit when-to-use/when-not guidance or reference to set_alert_template as the mutation alternative. Usage is implied (read before writing) rather than spelled out.

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