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

Annotations already cover the safety profile (read-only, idempotent, non-destructive, closed-world). The description adds useful scope ('current month's') and the metrics returned, but does not mention auth requirements, rate limits, or response shape, so it is only moderately additive.

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?

A single front-loaded sentence that states exactly what the tool returns with no filler. Every word earns its place for such a simple read operation.

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?

Given the low complexity, rich annotations, and no output schema, the description supplies the essential return content and time scope needed to select the tool. It stops short of describing response structure or edge cases, but is adequate for this simple stats endpoint.

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%, with the single apiKey parameter fully documented in the schema. The description adds no parameter-level meaning beyond the schema, so the baseline of 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 ('Get') and resource ('workspace usage') and names the three returned metrics (send count, contact count, plan limits). It does not explicitly differentiate itself from nearby siblings like get_workspace or whoami, so it falls short of a 5 despite being clear.

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?

The description implies usage for checking quota and plan limits, but gives no explicit when-to-use guidance or alternatives such as get_workspace. It is minimum viable implied context rather than actionable routing advice.

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