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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds meaningful behavioral context: deterministic, evidence-bounded, signed, and a 0.004 USDC cost. There is no contradiction with the read-only annotation since 'Detect' is consistent with it.

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?

The description is very short and front-loads the core purpose, but the semicolon splice before '0.004 USDC' is awkward and the cost fragment is not labeled as a cost. The behavioral terms are high-signal, but the structure feels fragmented rather than polished.

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 zero-parameter read-only tool with an output schema, the description covers purpose, cost, determinism, evidence-boundedness, and signing. However, it lacks when-to-use guidance relative to sibling tools and leaves the meaning of 'evidence-bounded' and the '0.004 USDC' fragment unexplained.

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?

There are zero named parameters and the schema only accepts an arbitrary object with minProperties 1. With no declared parameter contract, the description cannot meaningfully enrich parameter semantics, and the 0-param baseline of 4 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?

The description clearly identifies a specific action and resource: 'Detect self-transfer and reciprocal economic patterns'. The clause 'without presenting correlation as fraud' adds useful intent, but it does not explicitly differentiate this tool from siblings like trust_anomaly_detector or sybil_reputation_guard.

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 guidance about when to use this tool versus alternatives, and no sibling/alternative is named. The non-fraud caveat is a behavioral guardrail rather than a usage directive, leaving the agent to infer the appropriate context.

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