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

The annotations already establish that this is a read-only, closed-world operation. The description adds useful behavioral context beyond that: the timeline covers specific activity events and is only fully available on Pro and above, which implies partial results on lower plans.

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?

It is a single, front-loaded sentence with no wasted text. The event list and plan note both add useful information without bloating the definition.

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?

For a simple one-parameter read tool with annotations and no output schema, the description supplies enough context: what timeline is returned, which events appear, and the Pro plan limitation. It still omits pagination/error behavior, but that is a minor gap here.

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?

The schema has 100% coverage and already defines share_id as the share UUID. The description only implies that a share identifier is needed, so it adds little parameter meaning beyond the schema baseline.

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 clearly identifies the resource as a share's download timeline and names the events it contains (opened, clicked, started, finished). It is much more specific than the name get_receipts, but it does not explicitly distinguish itself from likely adjacent siblings such as get_delivery_status or get_share.

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?

Usage is implied by 'download timeline for a share', and the description adds the plan condition 'full timeline on Pro and above'. It does not state when to choose this over sibling status/history tools, nor does it name exclusions.

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