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

Beyond readOnlyHint/openWorldHint, the description adds genuinely useful behavioral facts: the link expires in 10 minutes, opens without authorization in a browser or curl, is scoped to a single file, and is not an API key. That last point preempts a likely misuse. It does not say what happens on expiry or whether regenerating is permitted.

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 compact sentences with the key fact (signed, 10 min, no auth) front-loaded. Nothing is redundant, though the parameter-origin note is tacked on rather than integrated into a structured form.

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 usefully conveys the return value (a signed URL with a 10-minute lifetime). But for a five-parameter tool with zero schema documentation, the missing explanation of connection_id and the name/mime_type parameters leaves the definition under-specified for callers.

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% across five parameters, so the description must carry the burden. It only clarifies key/path and their origin; name, mime_type, and especially the required connection_id are left entirely unexplained, leaving an agent to guess what connection_id identifies and whether name/mime_type are optional overrides.

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 verb and artifact: a signed temporary (10-minute) URL for downloading a file straight from cloud storage. An agent immediately understands the output is a URL, not file bytes. It stops short of naming sibling create_share_link, so the boundary between 'temporary download URL' and 'share link' is left to inference.

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 clause '`key`/`path` — from list_files' gives a concrete entry point, implying you list files first and then call this. However, there is no explicit when-to-use vs create_share_link or read_text_file, and no stated preconditions or exclusions.

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