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

The annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered. The description adds a non-obvious behavioral constraint — the call is refused while a sender address depends on the domain — which is genuine context beyond the structured fields.

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 short sentences, no filler, and the core action is front-loaded before the refusal constraint. Every sentence earns its place.

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?

For a destructive single-parameter deletion the description covers the key precondition, and annotations carry irreversibility and safety. However, it says nothing about permission requirements, what removal actually does to the domain's verification state, or the result of the call (no output schema exists), leaving moderate gaps.

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%, and the single required parameter 'id' is undocumented in both the schema and the description. The agent cannot tell whether this expects a domain ID, a domain name, or a workspace-scoped identifier, so the description fails to compensate for the 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?

The description names a specific verb and resource ('Remove a sending domain'), which cleanly distinguishes it from siblings like add_a_sending_domain, prove_a_sending_domain, and list_sending_domains by verb. It does not explicitly call out those siblings, but the operation is 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?

'Refused while the workspace's sender address is on it' gives a real precondition that tells the agent when the call will fail, which is useful guidance. It stops short of routing to alternatives (e.g., remove a member or change sender address first), so usage context is only implied.

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