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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, yet the description adds substantive behavior: the URL is temporary with an expiry, permission enforcement is server-side (trip membership plus document visibility/edit rights), and entitlements differ by role. The closing 'Safety: Closed-world' sentence largely restates openWorldHint=false and does not earn its space.

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 core behavior is front-loaded in sentence one, which is good, but the definition runs five sentences and the final safety/closed-world line duplicates the openWorldHint annotation. The untrusted-data warning is valuable; the account-scope restatement is 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?

An output schema exists, so return values need not be enumerated, and the description still flags the expiry field and the URL-document variant. Permission model and entitlement preconditions—the main failure modes for a single-id read—are covered, leaving little an agent would need to guess.

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% for the single `id` parameter, so the schema already carries the burden. The description only implicitly narrows `id` to a document identifier via 'accessible document', adding no format, prefix, or lookup guidance beyond that.

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 first sentence names a specific verb and output ('Get a temporary private download URL and expires_at') and clarifies the edge case that URL-type documents return the original link. This distinguishes it functionally from a metadata reader like tripsy_documents_show, though no sibling is named explicitly.

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?

It gives real usage context: the document must be accessible to the caller, owners need an active Pro subscription while permitted collaborators do not, and callers must not auto-fetch or execute the returned content. It stops short of naming an alternative tool or stating when to choose metadata retrieval instead.

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