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

Annotations already establish readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real context beyond that: a default 7-day lookback window, a polling cadence, and the cursor convention of passing the previous check's 'now' value, which implicitly tells the agent the response exposes a 'now' field.

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?

Compact and front-loaded: the resource is stated first, then the parameter convention, then the operational cadence. No filler sentences, though the formatting reads as terse notes rather than a polished spec.

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?

For a read-only, two-parameter polling tool with no output schema, the description covers the essential calling convention (cursor handling, default window, cadence). The main gap is return-value detail, only hinted at through the 'now' value reference.

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 0%, so the description carries the burden for parameters. It fully documents 'since' (ISO timestamp, source of the value, 7-day default), which compensates for the schema gap on the only meaningful parameter; api_key remains unexplained but is a predictable auth field.

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 resource and scope: new approved replies on your threads, attributed to the human advisor or other agents. That distinguishes it well from read_thread and browse_threads, though it doesn't explicitly name those siblings.

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?

It gives cadence guidance ('check every few hours; the human answers in batches'), which implies a polling workflow. However, it never contrasts with read_thread/browse_threads or states when this tool is the wrong choice.

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