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

Only readOnlyHint=false is annotated, so the description carries most of the burden and does so well: it discloses that registration is quota-limited by tier, that snapshots are not immediate, and that checks run through a shared queue. It omits what happens on rejection (e.g., quota-exceeded error) or whether registration is reversible.

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?

Four terse sentences, front-loaded with verb+resource, followed by the quota, latency, and auth facts in descending order of importance. Nothing is redundant or padding.

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 two-parameter mutation with no output schema and minimal annotations, it covers the operational essentials: quota, asynchronous snapshots, queueing, and auth. The remaining gap is what the call returns (e.g., a watch identifier) and how to verify success via list_my_watches or service_status.

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 both parameters are already documented, including the guidance to prefer a Bearer header over api_key. The description's 'Requires key' and 'supported Content API page' merely echo the schema, adding no syntax or format detail beyond it.

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+resource: 'Register a supported GOV.UK Content API page for scheduled monitoring.' This clearly separates it from read-side siblings like list_my_watches, page_changes, and inspect_govuk_page, though no sibling is named explicitly.

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?

Adds quota context ('Trial permits one, paid permits three') and auth ('Requires key'), which help decide whether the call can succeed. However, it never says when to prefer this over inspect_govuk_page or fixed_monitored_pages, nor what to do once the limit is reached.

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