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

Annotations declare readOnlyHint=false and destructiveHint=false, and the description resolves the apparent conflict by saying it "Saves the plan and changes nothing in the account". It also discloses that credentials are entered via a secure link and never in chat — a genuinely important behavioral caveat not in annotations. It stops short of describing idempotency or what happens on re-invocation with plan_id, so not a 5.

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?

Front-loaded with the trigger condition, which is exactly where an agent looks first. It is dense and long, and the return-value sentence partly restates the status-page/plain-HTTP point made two sentences earlier, so a little trimming is possible — but virtually every clause carries new information.

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 9-parameter, nested-object tool with no output schema, the description supplies what's missing: what it returns (integration or HTTP check, monitor cost against plan headroom, then a sequence of decisions), the credential flow, and the no-account-change guarantee. Nothing an agent needs to call this correctly is absent.

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 coverage is 100%, so baseline is 3. The description still adds meaning the schema doesn't: the interval defaults to the recommended value unless the user names another, decisions are answered "one step at a time" in a stated order (regions, components, severity), and accept_recommended never covers credentials. That is real added semantics for the answers/accept_recommended parameters, but several parameters (component_query, integration) get no extra treatment.

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 and resource — planning a monitored dependency for a site — and covers both the new-site and existing-site cases. It explicitly routes the agent away from check_service_status("Not for checking whether a service is down right now"), so the boundaries against the most confusable sibling are clear without opening a 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?

Gives an explicit trigger ("Use this when the user wants FlareWarden to watch a third-party service a site relies on"), the two valid contexts, and a named exclusion with the alternative tool. The catalogue-listed vs. status-page vs. plain-HTTP handling is also stated as a condition, not left to inference.

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