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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the description is free to spend its words on behavior — and it does, explaining what a completed handoff returns (share/secret id, keyless file link) and how to interpret emailed_to. It does not describe the pending/not-yet-used state, expiry, or what happens on a bad handoff_id.

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?

Three short sentences, front-loaded with the core question, then the return shape, then the one interpretive rule an agent needs. The middle sentence is dense and slightly ambiguous in phrasing ('the share or secret id, a keyless link for a file') but nothing is redundant.

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 no output schema, the description carries the burden of explaining return values and does so for the success case, including the emailed_to semantics. For a single-parameter read tool that is nearly complete; only the not-yet-used response and failure modes are unaccounted for.

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?

There is one required parameter with 0% schema description coverage, and the description never mentions handoff_id by name or states that it is the upload-link identifier. It does at least define the domain concept being looked up (a file upload link or a secret-typing link), which helps the agent pick the right id, but the mapping from parameter to concept is left implicit.

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 states a specific question the tool answers — whether an upload link (file or secret) has been used — and enumerates the identifiers it returns, which is enough to separate it from get_share, get_delivery_status and get_request_progress at a glance. It stops short of explicitly naming those siblings, so the differentiation is inferred rather than stated.

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 use case is implied: check on a handoff created via create_upload_handoff/create_secret_handoff to see if the recipient acted. There is no explicit when-to-call guidance, no mention of polling cadence, and no routing to alternatives such as get_delivery_status or get_share.

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