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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false. The description adds valuable context beyond this: 'Public — no auth required' and the rolling 24h nature of the 'today' snapshot. There is no contradiction; the description reinforces the read-only, non-destructive nature.

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 with no filler. The first sentence front-loads the return payload, the second gives usage context and auth status. Every word serves a purpose, making it concise and well-structured.

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?

No output schema exists, so the description carries the burden of describing the returned data, which it does by listing the components (top stories, active publishers, daily-brief, vertical hot lists). Combined with a single documented parameter and clear annotations, the tool is fully understood for selection and invocation.

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% with the window parameter fully described in the schema (enum, default, and advisory note about rolling 24h). The description adds no additional parameter-specific meaning, so it rightly relies on the schema. Baseline 3 is appropriate.

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 opens with a specific verb and resource: 'Return storyflo's current cross-vertical trending snapshot', enumerating exact contents (top stories, active publishers, daily-brief, per-vertical hot lists). This clearly distinguishes it from sibling tools like get_vertical_briefing or get_vertical_landscape by emphasizing 'cross-vertical' and 'trending'.

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?

The description explicitly says 'Use when the agent needs to surface what's hot on storyflo right now' and 'or to decide which vertical landscape to dig into next'., providing clear context. It also states 'Public — no auth required', aiding usage. However, it does not name specific alternative tools, so it stops short of a fully explicit when-not-to-use.

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