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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds useful scope (limited to the last N days, default 30, and reports trail depth) plus a hint at an administrator audience, but says nothing about return shape or aggregation behavior.

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 with no filler; the scope (audit trail, time window) comes first. The awkward '(administrators)' aside slightly muddies an otherwise efficient structure.

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 one-parameter read-only aggregate with no output schema, the description covers the resource, the time window, and the main aggregation dimensions well enough to invoke correctly. The ambiguous audience note is the only real gap.

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% and the single 'days' parameter is fully documented, including '0 = all time'. The description's 'over the last N days' merely restates the schema, so the baseline 3 applies.

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 the resource (audit trail) and the dimensions summarized (busiest tables, sources, people) plus the time window, so the agent knows roughly what it returns. However it is a noun phrase with no explicit verb, and the parenthetical '(administrators)' is ambiguous, so no crisp sibling differentiation from workspace_activity or ai_activity_log is provided.

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?

There is no statement of when to use this tool versus the many adjacent summary/log tools (workspace_activity, ai_activity_log, workspace_usage). Usage must be inferred entirely from the description's scope.

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