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

The annotations already declare readOnly, idempotent, and non-destructive, so safety is covered. The second sentence hints that 'ready' can be true before metadata checks finish, which is useful state semantics, but it is cryptic and does not say what is returned or how progress is expressed.

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?

Two short sentences with the purpose front-loaded, so there is little waste. However, the second sentence is dense and ambiguous, reading more like an internal note than a usable explanation.

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 should explain the return shape (progress fields, the 'ready' flag, metadata status), and it does not. For a read tool that agents will poll and branch on, the missing return-value semantics are a real gap.

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% for the single parameter, so the description must explain session_id; it never mentions it. An agent has to infer that the argument identifies the upload session being polled.

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 verb 'Read' plus 'transfer progress' gives a rough idea, but the description never names the resource as an upload session or mentions the session_id, so the link to the tool name is the main signal. It also does nothing to separate this from siblings like get_upload, list_upload_sessions, or resume_upload.

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 guidance on when to call this versus list_upload_sessions or get_upload, nor any note about polling cadence or prerequisites. The word 'progress' weakly implies polling during a transfer, but nothing states it.

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