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

With no annotations, the description carries the burden well: it discloses statefulness (baseline stored per id), the payment requirement ($0.01 USDC on Base paid via x402 in params._meta), and the HTTP endpoint. It omits edge-case behavior such as what happens on a first call for an existing id, id/address mismatch, or missing baseline, which keeps 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?

Front-loaded with the core purpose, then behavior, then pricing and transport in a compact three-sentence block. Every clause (statefulness, return metrics, payment, endpoint) earns its place for an agent that must call it correctly.

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?

Without an output schema, the description compensates by enumerating the return fields (balance delta in wei, outgoing-tx delta, blocks/seconds elapsed) and the payment mechanics. Missing only failure/edge-case handling for repeated polling, which would round out the picture.

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 coverage is 100%, so baseline is 3, but the description meaningfully adds to id semantics by explaining that reusing the same id is what yields the diff since the previous call — a behavioral contract the schema's generic 'opaque key' text does not fully convey.

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 ('stateful wallet-change monitor') and precisely describes the diff semantics: first call stores a baseline, later calls return balance delta in wei, outgoing-tx delta, and blocks/seconds elapsed. This clearly distinguishes it from the sibling walletprofile__profile, which is a snapshot rather than a stateful diff.

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?

Explicitly says 'Built for repeat polling of watchlists and alerts', which gives a clear usage context. However, it does not name an alternative (e.g. walletprofile__profile for one-off snapshots, or chgwatch__watch) or state when-not-to-use, so the agent must infer routing.

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