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

Annotations already declare readOnly=true, destructive=false, openWorld=false, so safety is covered structurally. The description adds genuine behavioral context beyond them: newest-first ordering, the 7–365 day history window tied to the plan, and a privacy detail (sign-ins expose the network, not the full address). It says nothing about pagination or truncation at the limit.

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?

A single front-loaded sentence ('WordPress sites: who did what') followed by a compact em-dash list of event categories, ordering, and window. Dense but every clause carries distinct information; no filler or restated title.

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?

No output schema exists, but for a read-only listing tool with full parameter documentation the description covers scope, ordering, and time window adequately. Minor gaps remain around return shape and default result ordering interaction with filter, none critical.

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 100%, so the schema already defines all five parameters, including the filter enum and the search meaning. The description largely restates the filter categories and adds only the 7–365 day numeric range. Baseline 3 is appropriate when the schema carries the parameter burden.

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 (activity log for WordPress sites) and enumerates the event categories it returns — sign-ins, roles, application passwords, updates, edits, PHP errors. An agent can tell it isn't a settings or health read. It doesn't explicitly differentiate from overlapping siblings like get_updates or get_notifications, which also touch update/alert data.

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 implies usage (audit 'who did what') but gives no explicit when-to-use or when-not-to-use guidance, nor does it point at alternatives such as get_updates or get_site_health. Intent is inferable from the enumerated content, which is the definition of implied usage.

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