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

Annotations already declare readOnly=true, idempotent=true and destructive=false, so safety is covered structurally. The description adds real behavioral context beyond that by defining the aggregate contents of the diagnostic (pause reason, warmup stage, cap consumption, bounce rate, next run time), which matters because there is no output schema. It stops short of 5 by omitting auth/permission or rate-limit notes.

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 sentences, front-loaded with the contents of the response and finished with the triggering question. The long enumeration is dense but every clause maps to a distinct returned field, so nothing is filler.

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?

With no output schema, the description carries the burden of telling the agent what comes back, and it does so field-by-field. Combined with the read-only annotations and full param coverage, an agent has everything needed to call and interpret this tool.

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 the single workspaceId param is fully documented in the schema, including how to enumerate values via get_status. The description's phrase 'for one site' corroborates the scope but adds no syntax or format detail beyond the schema, 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 resource and scope ('for one site') and enumerates exactly what the tool reports: sending on/off, pause reason, warmup progress, daily cap and usage, bounce rate, next run. An agent can tell this apart from sibling setters like set_sending and resume_sending, which change state rather than report it.

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?

Gives an explicit use case with quoted user questions ('why are so few emails going out', 'why did it stop'), which is stronger than a generic usage statement. It does not name an alternative tool or a when-not condition, so it falls short of the 5 bar.

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