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

With no annotations, the description carries the full burden. It does disclose a meaningful behavioral constraint — the document must be one 'you sent' — and it pre-describes the returned payload, which is valuable given there is no output schema. It says nothing about permissions, read-only nature, or behavior on an unknown/unauthorized id, so it is only partially transparent.

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?

A single tight sentence that front-loads the most useful content (status and signers). It wastes no words, though the sentence fragment lacks a verb, making it read as a return-value list rather than an action statement.

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 tool with no annotations and no output schema, the description usefully previews the response shape, which covers the biggest gap. It still omits the parameter's meaning and any usage routing, so it is adequate rather than 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 coverage is 0% and the sole 'id' parameter has no description, so the description should compensate. It implies the id identifies 'one document you sent' but never explicitly ties the parameter to a document identifier or specifies its format/source. Partial compensation only.

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 enumerates exactly what the tool surfaces about a single document (status, signer viewed/signed times, download links, event history), which is specific enough that an agent can tell it apart from list_documents. It never states the action verb (retrieve/get), but the resource and single-document scope are 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?

There is no explicit when-to-use guidance and no mention of alternatives such as list_documents for enumerating documents or get_evidence for audit material. The phrase 'one document you sent' weakly implies the single-document case, but nothing tells the agent when to prefer this over its siblings.

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