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

Annotations already indicate readOnly=false, destructive=false, and idempotent=true. The description adds meaningful context by stating the effect (participants can enter again) and the prerequisite call to fetch_sweepstakes, which enhances understanding beyond the raw hint flags. No contradiction detected.

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?

The description is well-structured with sections, but the opening sentence is unnecessarily repeated in the 'When to use' section, wasting a line. Despite this minor redundancy, it is otherwise concise and front-loaded, earning a 4.

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 tool, the description covers the action, the scenario, and the required pre-call. It does not describe the return value, but with no output schema and given the tool's simplicity, this is not a major gap. Overall complete enough for reliable invocation.

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%, and the description simply restates the parameter description from the schema ('The unique identifier (token) of the sweepstakes to unpause'). It adds no new semantics or usage nuance beyond what the schema already provides, so 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?

The description clearly states the tool's function: 'Reactivate a paused sweepstakes, allowing participants to enter again.' It uses a specific verb ('reactivate') and resource ('paused sweepstakes'), and effectively distinguishes from siblings like pause_sweepstakes and create_sweepstakes.

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 description explicitly says to 'Use fetch_sweepstakes first to get the sweepstakes_token' and includes a 'When to use' section. It also explains the pre-call needed when the user provides a name instead of a token, giving clear context for when this tool is appropriate.

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