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 and determinism are covered. The description adds the aggregation behavior (pre-computed totals over fixed windows) and names a sibling, but says nothing about caching, refresh cadence, or auth scope that would be genuinely new behavioral context.

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, zero waste. The metrics and windows are front-loaded and the sibling disambiguation is relegated to a short trailing clause.

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 an output schema present, the description need not explain return values, and it covers scope, metrics, granularity, and the alternative tool. For a zero-parameter read tool this is essentially complete; only auth/scope prerequisites are unaddressed.

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?

The tool takes zero parameters, so there is nothing to disambiguate and the baseline is 4. The description correctly implies the fixed windows are baked in rather than parameterized, which is consistent with the empty 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?

States a specific verb (Return) and resource (link-in-bio engagement totals), enumerates the exact metrics (views, link clicks, unique visitors/clickers), and the time windows (7/28/90 days, lifetime). It explicitly distinguishes itself from the sibling analytics_get_views, so an agent can select it without opening either schema.

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?

Clear routing guidance: 'Totals only; analytics_get_views provides the time series' names the alternative and the condition that selects it. It stops short of stating exclusions or prerequisites (e.g., auth/creator-scope requirements), so it is strong but not exhaustive.

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