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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value with the fingerprint-freshness gate, but says nothing about the download output (file vs. URL), failure behavior on a stale fingerprint, or idempotency, leaving a gap for an export tool with no output schema.

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?

One tight sentence, front-loaded with the action and immediately followed by the hard constraint. Nothing is padded, though the dense phrasing ('exact comparison fingerprint already reviewed') takes a moment to parse.

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 an export tool with no output schema and a multi-field required input object, the description omits the return shape and error behavior entirely. It covers the review precondition but not enough for an agent to call and consume the result confidently.

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 0%, so the description must carry parameter meaning, and it doesn't. It never mentions document_id, vendor, currency, or client_id, nor clarifies that the 'input' object carries all four plus the fingerprint — an agent must read the raw schema with no prose help.

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 and resource ('Download a vendor-statement worksheet'), which tells an agent what the tool does. It does not explicitly differentiate from adjacent siblings like list_vendor_statement_summaries or invoice_to_excel, but the 'worksheet' + 'fingerprint' framing is distinctive enough to be actionable.

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?

Gives a clear precondition: only use when the comparison fingerprint has already been reviewed, and states that changed comparisons require a new review. It stops short of naming which sibling produces the fingerprint or what to do instead, so it's strong but not complete routing guidance.

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