enable_sender_domain_inbound

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

No annotations provided, so description carries burden. Discloses that inbound email is enabled, replies are routed, and returns MX record. Lacks details on side effects, idempotency, or safety, but adequate for a simple enabling 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?

Four short, front-loaded sentences. Each sentence adds unique value: action, effect, prerequisite, return. No wasted words.

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?

No output schema, but description mentions return value. Covers what, why, prerequisite, and output. Could mention idempotency or integration with sibling tools, but overall complete for a simple tool with two params.

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 coverage is 100% with clear parameter descriptions. The tool description restates the DKIM requirement but adds no new semantic detail beyond the schema. Baseline 3 is appropriate.

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?

Clearly states the action 'enable inbound email on a verified custom sender domain', specifies the effect (replies route through run402) and return value (MX record). Distinguishes from siblings like disable_sender_domain_inbound and register_sender_domain.

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?

Provides clear prerequisite ('Requires DKIM-verified domain'), implying when to use. Does not explicitly mention when not to use or compare to alternatives, but context from siblings is sufficient.

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