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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, so the tool is known to be safe. The description adds value by disclosing that the output contains tokens that should be used internally and that only human-readable information should be presented to users. This is behavioral context beyond the annotations, hence a 4.

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 brief and front-loaded with the core action. However, the text is duplicated verbatim (the same sentences appear twice), which introduces redundancy. While this is likely a format artifact, it slightly harms structural clarity. Otherwise, every sentence provides value.

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 no-parameter, read-only list tool, the description covers what it returns ('a list of all sweepstakes with their details') and how to process the results (tokens vs. human-readable). It doesn't specify the exact fields returned, but no output schema exists, and the complexity is low. The presentation guidance adds useful context for an agent.

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 tool has 0 parameters, so the baseline is 4. The description correctly omits parameter details, and with 100% schema coverage (vacuously), there is nothing missing. No inconsistencies or gaps are present.

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 'Get all sweepstakes associated with your account' with a specific verb and resource, and scopes it to the user's account. This distinguishes it from other fetch_* sibling tools like fetch_participants or fetch_rules. The purpose is unambiguous and actionable.

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 implies when to use the tool: when you need all sweepstakes for the account. It also provides guidance on how to use the output ('Use tokens internally for tool chaining but present only human-readable information'). However, it doesn't explicitly mention alternatives or exclusions, so it falls short of a 5.

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