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

readOnlyHint=true already tells the agent this is a safe, non-mutating scan. The description adds genuine beyond-schema context: it enumerates the heuristics applied and explains that funding-cluster tracing expands the check from a single wallet to the funder's outbound ETH graph, which is important for interpreting results as 'Sybil ring' evidence rather than a per-wallet verdict. Rate limits, latency, and external data sources are not mentioned, keeping it short of a 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?

The core purpose is front-loaded and the analysis list is compact and information-dense. The trailing 'Args:' block largely duplicates the input schema's own address description, which is the only redundant element in an otherwise well-structured definition.

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 one-parameter read-only scan with an output schema present, the description supplies enough: what it checks, how funding clusters extend the analysis, and the required input. It does not need to explain return values because the output schema carries that, and annotations cover the safety profile.

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 a single parameter at 100% schema description coverage, the schema already documents the address fully. The description restates 'Base (EVM) wallet address (0x...)' without adding new constraints or format details, so it neither compensates nor detracts. 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?

The opening sentence gives a specific verb and resource: 'Scan a Base wallet for Sybil indicators', followed by the concrete signals analyzed (wallet age, transaction patterns, counterparty diversity, funding source, funding clusters). It is clear and unambiguous, but it does not explicitly distinguish itself from nearby trust-scoring siblings like moltguard_score or moltguard_detail, leaving the agent to infer the Sybil-specific scope.

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 only implied: an agent gathers that this tool should be called when Sybil risk needs checking. There is no explicit 'use this instead of X' routing against moltguard_score or moltguard_detail, and no prerequisites (e.g., whether the address must be on Base mainnet, whether a funded wallet is required).

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