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

The annotations already fully declare a safe, read-only, idempotent, closed-world operation. The description adds only a hint about content types (templates and scheduled blasts) and does not describe pagination, ordering, filtering, or return shape, so it adds little behavioral context beyond structured fields.

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 sentence with no filler, and the core content (templates and scheduled blasts) is front-loaded. It could be slightly more direct by starting with a verb like 'List'.

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?

For a zero-parameter, read-only listing tool with annotations covering safety, the description is adequate but incomplete: it does not clarify whether templates and scheduled blasts are returned together or separately, nor any pagination or ordering behavior. No output schema exists to offload that detail.

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?

The tool takes zero parameters, so there is no parameter syntax for the description to explain. Baseline 4 is appropriate for a parameterless tool.

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?

The description names the resource (Message Blast templates and scheduled blasts) and distinguishes automated vs one-time templates, so the agent can infer what is returned. However, it is a noun phrase without a verb, and it does not explicitly differentiate from siblings like estimate_message_blast or send_message_blast, which share the same domain.

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 guidance on when to call this versus related tools such as estimate_message_blast or send_message_blast. The agent must infer that this is a read-only listing tool from the name and annotations alone.

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