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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds useful domain semantics (base scope = real-user/primary environment, comparison scope = coverage), but says nothing about result shape, volume, pagination, or cost of wide time windows.

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 core scope distinction is front-loaded and the timeWindow syntax is shown inline via a compact example. The '(ListEventsRequest)' parenthetical and repeated platform enum spelling are mild filler, but the description is dense rather than padded.

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 complex nested-object tool with no output schema and only half its parameters documented, the description covers the essential scope/timeWindow mechanics but omits the credential parameters and filter semantics. It is adequate to attempt a call, not to call it optimally.

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?

With roughly 50% schema description coverage, the description must carry weight, and it does explain the semantic difference between baseExecutionScope and comparisonExecutionScope plus the two timeWindow forms with an example. But nested fields such as metadataFilters, release, branchName, and botId/projectApiKey auth requirements are left entirely to the schema.

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 identifies a specific resource: 'TrueCoverage event funnel summaries (ListEventsRequest)', which tells an agent this returns aggregated funnel data rather than raw events. It is distinguishable from siblings like get-truecoverage-event-details or -time-series by the word 'funnel', though it never names those siblings explicitly to draw the contrast.

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 real conditional guidance: comparison scope is optional and used 'for coverage', with automationEmitsOnly:true selecting test-tagged emits. It also states the prerequisite 'Prefer list-rum-environments first'. However, it never addresses when to choose this tool over the many other get-truecoverage-* siblings, so selection guidance is only partially covered.

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