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

The description discloses the full behavioral flow: a confirmation email is sent, the recipient must open a link and confirm on the page, and only then are alerts sent on score or check verdict changes. The statement 'Nothing is sent without the recipient opening the link and confirming on the page' adds meaningful consent/opt-in context that goes well beyond the sparse annotations (readOnlyHint=false, idempotentHint=false).

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 description is three sentences with the core purpose front-loaded in the first sentence. The second sentence provides necessary process detail, and the third adds usage guidance and a consent guarantee. No filler, though the second sentence is slightly dense.

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?

The description covers the essential flow: input site and email, confirmation step, and resulting alert behavior. An output schema exists, so return values need not be detailed. It does not mention prerequisites like whether the site must already be scored or what happens on duplicate watches, but these are not critical for correct invocation.

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?

The input schema already has 100% description coverage for both parameters. The description references the site and email at a high level but does not add format details or constraints beyond what the schema provides. This aligns with the baseline 3 for fully schema-covered parameters.

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 opens with a specific verb+resource: 'Watch a site's Agent Readiness Score.' It clearly explains the monitoring/alerting mechanism and distinguishes itself from siblings like score_site, list_checks, explain_check, and get_badge_embed by focusing on ongoing notifications rather than one-off scoring, listing, explaining, or embedding.

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?

The description explicitly states when to use the tool: 'Use when the user asks to monitor, track or be notified about a site's agent readiness.' However, it does not name any alternative tools or provide explicit exclusions, leaving some routing to inference given the sibling list.

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