Get per-vertical premium briefing

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

Annotations already signal readOnly, openWorld, idempotent, and non-destructive. The description goes further by disclosing the payment requirement, the x402 challenge on first call, the need to sign and retry, and the audio output format — behavioral details not present in annotations.

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?

Four dense sentences with no filler. The first sentence states the core function, followed by payment, validation, and authentication flow — each sentence serves a distinct purpose.

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 tool with no output schema, the description explains what is returned (audio briefing), the query window (last 24h), the vertical constraint, the auth challenge, and the payment method. This is complete given the tool's complexity and rich annotations.

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 0%, but the description fully compensates by listing all 7 allowed vertical values (tech, finance, news, science, health, young_moms, yoga) and adding the canonical-bucket constraint. This directly aids parameter selection beyond the raw enum in 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 clearly states the tool fetches a 'stitched audio briefing' of the top-25 trending articles for a single vertical over the last 24 hours. This specific verb+resource+scope distinguishes it from siblings like get_vertical_landscape and digest.

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 provides clear usage context: it is premium (USDC on Base via x402), the vertical must be one of 7 canonical buckets, and the first call without X-Payment triggers a challenge-retry flow. However, it does not explicitly name alternatives or state when not to use this tool relative to sibling tools.

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