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

Annotations already declare destructiveHint=true and openWorldHint=true, so the safety profile is covered. The description reinforces this with 'This call overwrites stored state' and clarifies the mutation can replace settings, toggle checks, and alter webhooks, adding real context. It stops short of noting auth/permission requirements or irreversibility detail, but the annotation bar is lower here.

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?

Three sentences, front-loaded with the core action and scope before the alternative-tool routing. Little waste; the overwrite warning could arguably merge into the first sentence but it earns its place as a risk flag.

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?

An output schema exists and the description still notes it returns the updated configuration. Combined with annotations carrying the destructive/open-world profile and 100% schema coverage, an agent has everything needed to call this correctly without further inference.

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%, so the omit-to-retain semantics of every field and the nested sitemap/notification options are already documented. The description echoes the sparse-update model ('only the fields to change') without adding format or constraint detail beyond the schema, so the 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?

States a specific verb (Update) and resource (one website-change monitor owned by the authenticated principal), scoped by id. It explicitly names the sibling tools it is not (monitors_get, monitors_delete), so its role is unambiguous among the monitors_* family.

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?

Names alternatives with conditions: use monitors_get to inspect current configuration, monitors_delete to remove the monitor. It also clarifies partial-update intent ('only the fields to change'), so the agent knows when to call this versus a read or delete.

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