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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavior: the response includes an authenticated download URL, results are only available post-completion, and the agent must not expose or guess foreign task IDs — a real access-control constraint beyond structured data.

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, zero filler, with the output content front-loaded before the security constraint. Every clause carries information the agent needs.

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 return-value burden and does name the two returned elements. It is thin on edge behavior — what happens if the task is still running, whether the URL expires, or how errors surface — which keeps it short of a 5.

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%, so the single task_id parameter is undocumented structurally. The description partially compensates by implying the ID must be one the caller legitimately holds ('do not expose or guess another task ID'), but it never states where the ID comes from (create_bulk_task) or its format.

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 gives a specific verb ('Return') and a concrete resource ('result metadata and the authenticated download URL'), scoped by the precondition 'after a task completes'. That implicitly separates it from the sibling get_task_status, but it never names that sibling the way a 5 would.

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 phrase 'after a task completes' implies the usage context, but the agent must infer that get_task_status is the tool to poll first. There is no explicit when-not or named alternative, so usage is only implied.

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