Create Domain Pointer

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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the agent knows this is a non-idempotent write with no destructive effect. The description adds useful context that the pointer is 'attached to an existing domain' and that alias mode serves the target's mailboxes, but it says nothing about permission/verification requirements, duplicate-pointer conflicts, or what happens on repeat calls.

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?

Two tight sentences with zero filler; the core operation is front-loaded and the alias semantics follow immediately. Slight redundancy with the schema's alias description is the only inefficiency.

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, annotations cover the safety profile, and the full parameter set is schema-documented, so the description need not explain return values. What remains thin is the precondition/error context around attaching a pointer, which keeps it just short of fully complete.

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%, so all three parameters are already documented in the input schema. The description's alias=true/false explanation largely restates the schema's own parameter description, adding no new syntax, constraints, or defaults beyond it. Baseline 3 applies when the schema does the heavy lifting.

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 uses a specific verb and resource: 'Attaches a pointer domain to an existing domain,' and immediately distinguishes the two resulting behaviors (alias vs redirect). It does not explicitly differentiate itself from siblings such as delete_domain_pointer or list_domain_pointers, but the name and verb make the create-only role unambiguous.

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?

There is no explicit guidance on when to use this tool versus create_domain, delete_domain_pointer, or list_domain_pointers, nor any stated prerequisites (e.g., the target domain must exist on the account). The alias/redirect explanation clarifies a mode choice once the tool is selected, but not the tool-selection decision itself.

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