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

With no annotations provided, the description carries the full burden of behavioral disclosure. It explains that the tool is free, consumes no credits, requires proof of npub ownership, and exists to prevent statement-scraping of arbitrary patrons. It does not explicitly state read-only behavior or rate limits, but the provided context is substantial for a no-annotation tool.

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 four short sentences that front-load the purpose, then list the returned data, disambiguate from the tax balance, and state cost and auth requirements. Every sentence earns its place with no redundant filler.

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?

Given three parameters, 100% schema coverage, and an output schema, the description covers purpose, contents, cost, auth prerequisite, and the tax-balance confusion risk. It could explicitly distinguish itself from the infographic sibling, but for correct invocation it is sufficiently 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 dpop_token parameter is already described in detail in the schema. The description adds the rationale for the ownership proof requirement but does not add new syntactic meaning to the parameters, so the baseline of 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 description uses a specific verb ('Generate a patron's account statement') and enumerates the returned contents: purchase history, active credit tranches, per-tool usage breakdown, and daily usage logs. It also distinguishes the patron's spending account from the operator's Authority tax balance, but it does not explicitly differentiate itself from the sibling tool authority_account_statement_infographic.

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?

The description gives clear context: use this when you need a patron's spending account statement, not the operator's Authority tax balance. It also states that it is free and that proof of npub ownership is required. However, it does not name an alternative tool or explicitly compare itself with the infographic sibling.

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