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

Annotations cover the mutation profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true), and the description adds meaningful context beyond them: submissions go through human review of the sponsor and official rules before publication, so the agent knows this is not an instant-publish action. Missing auth/permission notes and any rate-limit or duplicate-submission behavior keeps it from a 5.

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?

Four short sentences, front-loaded with the call to action and the target resource, then the review process, then the eligibility restriction. Every sentence carries a distinct piece of information with no padding.

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 six-parameter, single-required submission tool with no output schema, the description supplies the purpose, eligibility limits, and the moderation outcome, which is nearly everything needed to call it correctly. It stays silent on what the submitter sees back (e.g., an acknowledgement or tracking of the pending submission), a minor 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 description coverage is 100%, so all six parameters are already documented, giving a baseline of 3. The description reinforces the intent of 'url' (official entry or rules page) and the free-entry eligibility constraint, but adds no format or validation detail beyond what the schema already states.

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?

States a concrete action and resource: send the link to a sweepstake's official entry or rules page so it can be considered for listing. It also names the destination platform (UltimateSweepers) and scopes the content type (free-to-enter sweepstakes only), making it clearly distinct from the read-only siblings get/list/search.

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?

Gives a clear triggering condition ('Know a free-to-enter sweepstake that isn't on UltimateSweepers yet?') and an explicit exclusion ('no paid raffles or purchase-required contests'), which tells the agent when not to call it. It does not name a sibling tool as the alternative for lookup, but the exclusions cover the main mis-invocation risk.

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