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

Annotations cover the safety profile (readOnlyHint=false, idempotentHint=false, openWorldHint=true), and the description adds real context beyond them: retention/expiry semantics, possible credit consumption, and the POST /storage/v1/files endpoint. It omits auth requirements and the exact response shape, keeping it below 5.

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?

Dense but front-loaded: the WRITE marker and the core purpose come first, followed by lifecycle and cost notes. Every clause carries information, though the compressed 'WRITE: ...' phrasing and stacked asides read a little telegraphically.

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 states the return value (a file_id) and resolves the schema's ambiguity of zero required parameters by saying the caller must give a url or base64 payload. Format limits and content-type detection are left to the schema, which covers them fully.

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 100%, so the schema already documents url, filename, data_base64 and content_type in detail. The description only restates the url-vs-base64 choice, adding little beyond what the parameter descriptions provide, so the baseline 3 is appropriate.

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?

Opens with a specific verb+resource pair ('WRITE: store a file in your Doxis AI.dp storage') and states the payoff ('get a file_id to reuse in other tools'). That makes it clearly distinguishable from the capture_*, download_file and document_* siblings, which either consume a file_id or transform an already-uploaded document.

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 parenthetical 'capture the same file several times without sending it again' tells the agent the situation that selects this tool over re-sending bytes to each capture call, and 'Give a public https url or small base64 data' steers input choice. It never states an explicit when-not or names an alternative tool, so it falls short of 5.

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