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

With only readOnlyHint/openWorldHint from annotations, the description carries the burden and delivers: it explains the healthScore formula and scale, the null conditions (off, or fewer than 20 checked), what currentPerDay represents, and that when configured is false the values are defaults. This is substantial disclosure well beyond the annotations.

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?

Front-loaded with the verb and resource, and every clause carries real information (ramp semantics, healthScore definition, defaults). It is a dense run-on sentence but not padded; slightly heavy for a single-parameter read.

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?

There is no output schema, and the description fully compensates by describing the return shape and the meaning/edge cases of each field. An agent can interpret the response correctly without any additional 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% and there is a single 'id' parameter already documented (from list_sender_emails). The description adds no further meaning to the parameter, so the baseline 3 applies.

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 (Reads) and resource (a mailbox's warm-up settings) and enumerates the exact fields returned (ramp, weekly limits, timezone, currentPerDay, healthScore). It even distinguishes itself from the mutation siblings by noting warm-up volume is separate from campaign sending limits changed with update_sender_email.

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?

Usage is implied rather than stated: the agent can infer this is the read counterpart to update_sender_email_warmup, and the note about update_sender_email clarifies a boundary. But there is no explicit when-to-use guidance versus the other get_sender_email*, get_sender_reputation, or get_deliverability_insights siblings.

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