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

With no annotations, the description carries the behavioral load and does a fair job: it discloses cadence (hourly), duration (30 days), that alerts go to a webhook, the return value (id), that polling GET /monitor/:id is free, and the cost ($1.00 USDC). It omits the payment/auth mechanism and what actually constitutes a detected change.

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?

The text is dense and front-loaded: use case first, then return value, then example, then price. Every clause carries information. The telegraphic notation ("selector?", "$1.00 USDC") is slightly cryptic but not wasteful.

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 4-parameter tool with no annotations and no output schema, the description covers lifecycle, cost, and return. Two gaps remain: how change detection is configured via keyword/selector, and what payment or authorization is required to invoke it. Fixing the parameter semantics would make it complete.

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% across 4 parameters, so the description must compensate and largely fails. The example mentions url, webhook, and an optional selector but assigns them no meaning, and the `keyword` parameter is never mentioned at all — leaving the crucial keyword-vs-selector distinction undocumented.

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 operation and scope: a 30-day, hourly web-change monitor with webhook alerts, plus example target page types. That distinguishes it from one-shot siblings like read_url or extract_links, though it never names them, so sibling differentiation is only implied.

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?

"Use this for 30 days of hourly web change monitoring" gives a clear trigger context, but there is no stated alternative (e.g. when to use read_url for a one-off check instead) and no guidance on when this is a poor fit. Usage is implied rather than spelled out.

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