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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so safety is covered structurally. The description adds nothing beyond that shell — no pagination behavior, no result ordering, no clarification of whether the status filter is inclusive. Minimal 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?

One short sentence with no padding or waste, and it is front-loaded. But its brevity reflects under-specification rather than efficient communication.

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?

An output schema exists, so return shape need not be described, and the annotations carry the safety profile. What remains missing is any indication of pagination expectations, default limits, or how the list is ordered, which for a paginated list tool would help an agent call it correctly.

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 description coverage is 100%: limit, cursor, and the status enum are all self-documenting, so the baseline of 3 applies. The description contributes no additional parameter meaning, such as default page size or cursor expiry.

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 verb (list) and resource (email templates), so the basic purpose is inferable. However it is essentially a restatement of the name/title with no added scope, and it does not distinguish itself from the sibling get_template, which an agent must infer is the single-item counterpart.

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?

There is no when-to-use guidance, no mention of the alternatives (get_template for one template), and no stated conditions. The agent gets no routing signal beyond the tool name.

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