mailX tools

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

Annotations cover key traits (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=true), so the bar is lower. The description adds minimal context by implying a hosting/serving action, but does not detail behavioral aspects like rate limits, authentication needs, or what 'host and serve' entails operationally. No contradiction with annotations exists.

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, efficient sentence that front-loads the core action ('Host and serve') without unnecessary details. Every word contributes to understanding the tool's purpose, making it appropriately sized and well-structured.

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?

Given the tool's moderate complexity (2 parameters, no output schema), annotations provide safety and idempotency info, but the description lacks completeness. It does not explain what happens after hosting (e.g., how the file is served, any URLs or confirmation returned), leaving gaps for the agent to infer outcomes.

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%, with clear descriptions for both parameters (domain_name and bimi_file). The description does not add meaning beyond the schema, such as explaining the purpose of these inputs in the hosting process, so it meets the baseline of 3 without compensating for any gaps.

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 ('Host and serve') and resource ('BIMI SVG file for email authentication'), distinguishing it from sibling tools like bimi_check (which likely verifies rather than hosts) and other DNS/email authentication tools. It specifies the exact purpose without being vague or tautological.

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 no guidance on when to use this tool versus alternatives. It does not mention prerequisites (e.g., needing a domain and BIMI file ready), exclusions, or comparisons to siblings like bimi_check or dmarc_generate, leaving the agent to infer usage context.

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