mail_set_domain_mail

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

Annotations declare readOnlyHint=false, destructiveHint=false, openWorldHint=false, so the agent knows this is a non-destructive write. The description adds little beyond that: it doesn't say whether it overwrites an existing catch-all, what happens on failure, or that it requires the domain to exist. Minimal behavioral context for a mutation tool.

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 one-line purpose is front-loaded and efficient, but the Args block merely repeats parameter names, adding length without value. Adequate but not tight.

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?

An output schema exists, so return values need not be explained. However, for a two-parameter mutation with 0% schema coverage and minimal annotations, the description is too thin: it doesn't explain parameter meaning, side effects, or prerequisites. Gaps remain an agent would need to call it correctly.

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 0%, so both parameters are undocumented in the schema. The description only restates the parameter names in Russian ('domain: Домен', 'domain_mailbox: Имя ящика...') without adding format, constraints, or examples. This does not compensate for the 0% coverage gap.

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?

States a specific verb+resource: setting a catch-all mailbox for a domain. The Russian description ('Назначить catch-all ящик для домена') clearly identifies the operation and distinguishes it from siblings like mail_create or mail_clear_domain_mail. Not a perfect 5 because it assumes the agent understands 'catch-all' semantics.

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 explicit when-to-use guidance or alternatives named. The agent must infer this is the right tool versus mail_clear_domain_mail (to remove) or mail_create (to make a specific mailbox). No conditions, prerequisites, or exclusions are stated.

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