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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so the description's safety burden is low. It meaningfully adds that the tool returns a temporary download link valid for one hour, that the document is titled DEPOSIT STATEMENT, and that movements appear in date order with a closing balance. No contradiction with annotations.

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 short, front-loaded, and each key clause conveys needed information about invocation and return format. The trailing 'Pro.' is cryptic and adds little, which prevents a 5, but the overall structure is efficient.

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 read-only and idempotent annotations plus complete schema coverage, the description covers the main missing piece: the output is a one-hour download link. It does not address error cases, multi-match client resolution, or permission requirements, but those are not essential for a basic correct invocation.

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%, so the baseline is 3; the schema already documents as_of, client, currency, and out_path. The description reinforces that one client is targeted and that the result is a link rather than a file, but it does not add meaningful details beyond the schema.

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 names a specific deliverable — one client's A4 deposit statement rendered as a PDF with a download link — and the PDF return clearly distinguishes it from siblings like deposit_statement_text. The verb 'render' plus the resource and format is concrete and unambiguous.

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 a positive directive ('Call this tool to render...') and clarifies the single-client scope, which helps the agent avoid multi-client report tools. However, it never explicitly contrasts with deposit_statement_text, deposits_report, or other siblings, nor explains when the text variant should be preferred.

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