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

Annotations already declare readOnlyHint, non-destructive and non-open-world, so 'Reads only' adds little. What does add value is the disclosed status semantics: that 'confirm_again' means the workspace's account type changed after the monitor was switched on and a person must re-confirm it, plus the ordering of weekly readings (newest first) and the signal fallback rule (open, else the latest).

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?

It is front-loaded helpfully with the resource and the 'whether it is on' question, and no clause is empty. But it is delivered as one very long run-on sentence that chains five or six distinct return concerns together, making it harder to scan than a short structured list.

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 explaining the return shape and does so field by field (enabled state, domain, account, last status, monthly cap and usage, weekly new/lost domains, link-spam signal, cap-choice coverage). The main omission is edge-case behavior, such as what is returned when no monitor exists for the client.

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 clientId parameter is already documented as coming from list_clients. The description adds no additional meaning about the parameter (no scope, workspace, or format hints), so 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?

Opens with a specific verb-and-resource framing ('The weekly spam check of a client's new linking domains... whether it is on') so the agent knows this reads the link-monitor configuration plus its readings. It is clearly distinct in substance from set_link_monitor and get_link_overview, though it never names those siblings to make the distinction explicit.

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?

Usage is only implied: an agent must infer that this is the read counterpart to set_link_monitor and that it is preferred over get_link_overview / get_referring_domains when monitor state itself is wanted. There is no explicit when-to-use, when-not-to-use, or prerequisite statement.

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