validate_email

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

Annotations indicate readOnlyHint=false, openWorldHint=true, and destructiveHint=true, but the description adds no behavioral context whatsoever. It does not mention side effects, required permissions, rate limits, or what happens during validation. With annotations present, the description still fails to add any transparency beyond the structured data.

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 under-specified line—just the endpoint. While it is short, this is under-specification rather than conciseness, as it lacks any structure or useful content. It does not front-load any meaningful information.

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 description is completely inadequate for a tool with 2 required/optional parameters, no output schema, and destructive hints. It does not explain the validation process, return values, or any operational context. The schema partially describes parameters but cannot compensate for the missing behavioral and usage context.

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 descriptions for both 'email' and 'dry_run' in the schema. The tool description itself provides no parameter information, but according to the baseline for high schema coverage, a score of 3 is appropriate. The description does not add value beyond the schema.

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 is merely the API endpoint 'POST /api/v2/emails/validate/', with no explicit statement of what the tool does. It does not distinguish from sibling tools like api_post_v2_email_check or send_email. The name 'validate_email' implies purpose, but the description itself is missing and 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?

No guidance is provided on when to use this tool versus alternatives. The context signals show many sibling tools for email-related operations, but the description gives no criteria, prerequisites, or exclusions. It is impossible to know when to choose this over similar tools.

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