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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely non-redundant behavior: the exact metric set returned and that every metric carries a change-vs-previous-period comparison, which matters because there is no output schema.

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, front-loaded with the resource and its scope, followed by the single-sentence usage cue. The metric enumeration is dense but each item earns its place since no output schema exists to carry it.

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 no output schema, the description correctly compensates by enumerating return fields and comparison semantics, and annotations cover the safety profile. The only remaining ambiguity is how the 'previous period' is derived relative to the days parameter, which is left implicit.

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% and both parameters (days, platform) are fully documented in the schema, so the description need not repeat them. It adds no format or interaction detail beyond that, which is the baseline case.

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?

Names a specific verb+resource (get analytics overview) and enumerates exactly what is returned: views, reach, engagements, posts, followers, with period-over-period change. It implies account-level scope via 'for the account,' but never explicitly distinguishes itself from close siblings like get_platform_analytics or get_content_insights.

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?

'Use this to understand overall account health' gives a purpose-implied context but names no alternatives and no conditions for choosing this over get_platform_analytics, get_follower_stats, or get_audience_insights, all of which live in the same analytics cluster.

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