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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered externally. The description contributes one behavioral detail — that schemas are optional and add weight to the response — but says nothing about pagination behavior, response shape, or what happens for an invalid plan ID.

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, and the key scope ('tracking plan') plus the notable option ('schema details') both appear immediately. It is efficient, though its brevity borders on under-specification for a tool with two required IDs.

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 simple, closed-world list tool with full safety annotations and no output schema, the definition is workable. It nonetheless omits the relationship to list_tracking_plans as a discovery step and gives no sense of what an 'event' record contains or how pagination terminates, leaving gaps an agent would want filled.

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 75%, just under the high-coverage threshold, and the schema already explains page, includeSchemas (including its response-size warning), and the tracking_plan_id provenance. The phrase 'optional schema details' is the only param-related meaning the description adds, which is marginal beyond includeSchemas' own schema text.

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 verb and resource ('List events in a tracking plan') and adds the scoping modifier 'with optional schema details'. This clearly distinguishes it from list_tracking_plans (which lists plans, not their events), though it does not explicitly separate it from siblings like get_source_event_schemas or list_data_catalog_events.

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 when-to-use guidance, no prerequisites, and no named alternatives. The fact that a tracking_plan_id from list_tracking_plans is required appears only in the schema, not the description, and the description never says when to prefer this tool over the event-schema siblings.

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