verify_sending_domain

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

With no annotations, the description carries the behavioral disclosure burden. It does add meaningful behavior beyond the name: 'now instead of waiting for the background monitor.' However, it does not mention whether the check triggers side effects, whether it is idempotent, or what result the caller should expect.

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?

The description is a single sentence with no filler. The key contrast ('now instead of waiting for the background monitor') is front-loaded and each word earns its place.

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 simple one-parameter tool, the description covers the core operation and timing, but it does not explain what the tool returns, whether success is indicated, or what 're-check' means in terms of the background monitor. The lack of an output schema makes this gap more noticeable, though the operation itself is straightforward.

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 schema has one required 'id' parameter with no description, and schema coverage is 0%. The description only implies that the id refers to a sending domain, but it does not explicitly explain what id should be passed, where to obtain it, or what format it takes. This leaves the agent to infer a critical input.

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 uses a specific verb ('Re-check') and resource ('a domain's DNS records'), and immediately distinguishes the action from the background monitor. This clearly differentiates it from siblings like add_sending_domain or list_sending_domains.

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 gives clear context: use this tool when you want an immediate DNS re-check rather than waiting for the background monitor. It does not explicitly name alternatives or exclusion cases, but the timing contrast provides sufficient selection guidance.

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