list_emails

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

No annotations are provided, so the description must disclose behavioral traits. It only states the listing action and optional filter, but does not mention permissions, side effects, pagination, or return format. The agent is left to infer that this is a read-only operation.

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, front-loaded with the verb and resource, and contains no redundant words. It is optimally concise while conveying the essential behavior.

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?

The tool is low in complexity with one optional parameter and no output schema. The description adequately states the purpose and filter capability, but does not describe the return format or any caveats. With no annotations or output schema, a bit more detail would be expected for full completeness, though the core function is covered.

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 input schema already includes a complete description of the single 'domain' parameter ('Limit results to this domain'), with 100% coverage. The description's mention of the optional filter adds minimal extra meaning, so it meets the baseline for schema-backed parameter documentation.

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 clearly states the action ('List') and the resource ('email accounts'), and notes the optional domain filter. This effectively distinguishes it from sibling tools like list_databases and list_domains, which target different resources.

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 provides clear context for when the tool is appropriate: any time you need to list email accounts. The optional domain filter adds a specific use case. However, it does not explicitly name alternatives or exclusions, but the purpose is unambiguous enough to guide selection.

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