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

Goes well beyond the readOnlyHint/openWorldHint annotations by disclosing the paid-access mechanics: $0.03 USDC per call via x402 on Base mainnet, an unpaid call returning a PaymentRequired challenge, and the exact retry pattern using _meta["x402/payment"]. This is exactly the operational context an agent cannot infer from 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 short sentences, front-loaded with the retrieval scope and followed by the payment flow; every sentence carries weight. The opening noun fragment is slightly abrupt but not wasteful.

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?

Covers purpose, data source, and the full payment lifecycle, which is the hardest part for an agent to get right. With no output schema, it could say more about the shape or size of the returned actor list, but for a single-parameter lookup this is nearly complete.

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 the single 'sector' parameter is documented with concrete examples (energy, water, manufacturing, oil-and-gas, chemical, nuclear). The description only restates 'specific industrial sector' and adds no format or matching rules, so baseline 3 applies.

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?

States a specific verb+resource ('All ICS threat actors targeting a specific industrial sector') plus the data source (live MITRE ATT&CK ICS STIX). An agent knows exactly what it retrieves. It does not explicitly differentiate from sibling sector tools like getSectorBrief or getSectorSitrep, so it stops short of 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?

There is no when-to-use or when-not-to-use guidance. With four sector-oriented siblings (getSectorBrief, getSectorDelta, getSectorSitrep) and actor-oriented siblings (getActorDossier, getThreatActor), the description never explains which to pick for a given need.

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