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

readOnlyHint=true already establishes safety, so the description's contribution is the account-feature restriction and the disclosure of what the records contain (start/end, timezone, repeat interval, state, covered checks/tags). It does not discuss pagination behavior or rate limits, which would have raised it further.

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 tight sentences: the resource definition and return fields come first, the account constraint second, and the API endpoint last. No filler and nothing repeated from the title or schema.

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 usefully enumerates the return fields and flags the feature-gate constraint, covering what an agent needs to call and interpret it. Pagination semantics live in the schema, but result ordering and total-count behavior are unaddressed.

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 all three parameters (page, limit, state) documented and an enum on state, so the schema already carries parameter meaning. The description's mentions of "state" and coverage are about returned fields, not parameter usage, so it adds nothing beyond the schema. 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?

Specific verb+resource ("List maintenance windows"), plus a clarifying gloss ("scheduled alert silences") and an enumeration of the fields returned. This lets an agent distinguish it from statuscake_get_maintenance_window (singular fetch) without opening either schema.

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?

"Only works on accounts using the newer maintenance-windows feature" is an explicit eligibility precondition that prevents wasted calls on legacy accounts. It gives clear context but does not route the agent to alternatives (e.g., get_maintenance_window for a single window) or state exclusions beyond the feature-gate.

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