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

Annotations already declare readOnly/idempotent/destructive=false, so the safety profile is covered. The description adds genuinely new behavioral context beyond annotations: a per-call price of $0.50 USDC settled via x402 on Base or Solana, which an agent must know before invoking. It does not state freshness/cadence of the underlying data or what happens on payment failure, keeping it below 5.

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?

Front-loaded with the return contents, followed by the usage hint and then the payment terms; no filler sentences. The indicator enumeration is long but each item is information the agent needs to judge fit, so it 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?

With no input parameters and no output schema, the description carries the return-value burden and does so by naming every indicator and the cycle-phase signal. The main remaining gap is data recency/as-of semantics and failure/payment-error behavior.

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?

Zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly signals a no-argument call by describing the output rather than implying undocumented inputs.

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 ('Returns a macro health snapshot') and enumerates the exact indicators included plus the derived cycle-phase signal, so an agent knows precisely what payload to expect. It does not, however, differentiate itself from siblings that expose overlapping data (get_recession_indicator, get_yield_curve, get_policy_spread, get_bundle_rate_environment), leaving the bundle-vs-single-series choice ambiguous.

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?

'Use this for macroeconomic context or recession risk assessment' gives a usage context, but no exclusions and no named alternative, even though get_recession_indicator and get_yield_curve expose subsets of the same data. An agent must infer when the $0.50 bundle is preferable to a narrower, presumably cheaper, single-indicator call.

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