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

Annotations already cover safety (readOnly, idempotent, non-destructive, not open-world), so the description earns credit for adding non-obvious behavior: it reads the optional X-7Maps-Key header, degrades to a one-line notice when absent, is scoped to one person, and is free of charge. It does not describe latency or failure modes of the read itself, keeping it out of 5 territory.

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?

The trigger condition is front-loaded and the metrics are enumerated in one pass with no filler or marketing language. It is a dense run-on sentence, though, with phrases like 'an estimate of the tokens saved compared with finding the same thing out without 7Maps' that could be tightened.

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 return-value burden and does so by listing every reported metric plus the no-key fallback, which is sufficient for an agent to call it correctly. It omits nothing critical, though it could note the response shape of the failure breakdown more concretely.

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 enum parameter is fully documented there, so the baseline is 3. The description implies all three windows are returned ('today, in the last 7 days and in the last 30 days') but never mentions the 'window' parameter or its role in choosing which period leads the response.

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 pairing (report personal 7Maps key usage) and enumerates exactly what is counted: calls, servers checked, token savings, failures avoided, average response time. Its scoping to 'that person's own counts' implicitly separates it from the server-wide sibling my_server_report, but no sibling is named explicitly, so it stops short of a 5.

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?

'Use this when the person you work for asks what 7Maps has done for them' gives an explicit triggering condition, and the fallback behavior without a key is spelled out. It does not name a competing tool (e.g. my_server_report or about_7maps) or any when-not-to-use condition, so it lacks the routing precision of a 5.

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