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

Beyond the readOnlyHint/openWorldHint annotations, the description discloses the fan-out behavior across five endpoints, the exact cost ($0.35 USDC per call via x402 on Base mainnet), and the failure mode for unpaid calls including how to retry with the signed payload in _meta["x402/payment"]. That is precisely the operational context annotations cannot carry.

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, front-loaded with what the tool is and what it returns, then the payment mechanics. The payment sentence is long but earns its place because the retry protocol is non-obvious and essential to a successful call.

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 carries the burden of describing the return contents (threat landscape, top actors, advisories, deltas, compliance impact, weekly priorities) and it does so. Combined with cost and payment-failure handling, an agent has everything needed to call this correctly.

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% for both parameters, so the schema already documents 'sector' enumerations and the 'period' lookback default. The description only restates the 30-day default and adds no format or constraint detail beyond the schema, making the baseline 3 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 names a specific deliverable ('30-day situation report for an industrial sector') and enumerates the fan-out endpoints and the sections returned, so the agent knows exactly what it produces. It does not contrast itself with nearby siblings such as getSectorBrief or getSectorDelta, which is the only thing keeping it off a 5.

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?

Usage is implied by the '30-day situation report for an industrial sector' framing, and the payment/retry protocol is spelled out clearly, which is real invocation guidance. However, there is no explicit when-to-use versus alternatives (e.g., the lighter getSectorBrief or the delta-only getSectorDelta), so selection still requires inference.

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