Get per-vertical premium briefing

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

Beyond annotations (readOnlyHint, idempotentHint), the description adds critical behavioral traits: payment requirement, settlement token (USDC), protocol (x402), and the two-call challenge flow. No contradictions with 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?

Three sentences packed with essential information: purpose, payment model, and invocation flow. No redundant phrases. Front-loaded with the main action. Every sentence earns its place.

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 tool with one enum parameter and no output schema, the description covers the input constraint, payment flow, and result type (audio briefing). Missing details like typical response size or whether results are cached, but adequate 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?

With 0% schema description coverage, the description compensates by listing the canonical 7 buckets and stressing that vertical must be exactly one of them. While it largely restates the enum, it provides context like 'canonical 7 buckets' and groups them, adding marginal meaning beyond the raw enum.

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 verb 'Fetch', the resource 'stitched audio briefing of top-25 trending articles', and scope 'single vertical from last 24h'. It distinguishes from siblings by specifying vertical-specific, premium audio briefing, which is not evident in siblings like 'digest' or 'get_audio_url'.

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: premium payment via x402, challenge-response flow, and required vertical from canonical 7. However, it does not explicitly state when not to use this tool or suggest alternatives among siblings, such as using 'digest' for non-premium or multi-vertical briefings.

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