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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds genuine value by disclosing a time window ('events refused in the last 24h and why') and the breadth of returned configuration, but the phrase 'alerts and their channels (with manage)' is ambiguous and nothing is said about permissions, response size, or nesting.

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?

Two sentences with no filler: a dense but purposeful content list followed by the diagnostic use case. The enumeration is long but each item is information an agent needs to know the response covers, and the usage cue is short and clear.

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?

With no output schema, the description carries the burden of describing return content, and the enumeration largely does that — including diagnostic-relevant signals (data arrival, refused events). Minor gaps remain around what 'with manage' means and whether alerts are writable from here, but an agent can call this correctly and interpret the result.

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?

There is exactly one parameter, and schema coverage is 100% — the schema itself says 'site_id from list_sites, or the site name.' The description adds no syntax, format, or lookup guidance beyond that, so the baseline 3 applies; the schema does the work here.

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 resource and scope ('One site's configuration and health') and enumerates the concrete contents: allowed domains, refusal counts, currency, tracker features, alerts, install snippet. That enumeration clearly distinguishes it from the report siblings (get_overview, get_timeseries, run_funnel), though it never names an alternative 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?

It gives an explicit triggering condition: 'Use it to diagnose missing data before reading reports,' which routes the agent here ahead of the analytics siblings. It stops short of stating when not to use it (e.g. for listing all sites, use list_sites, or for metrics, use the report tools).

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