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

Annotations already declare destructiveHint=false, idempotentHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds the auth requirement (organizer key), which is genuinely beyond the annotations, but omits what happens on duplicate entries or to existing ones.

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, front-loaded statements with essentially zero waste. It is slightly run-on (no punctuation between the two clauses), but nothing is padded.

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 two-parameter mutation with no output schema, the description covers the key precondition (organizer key) and is backed by annotations for safety flags. It still leaves entrants/duplicate behavior and result format unexplained, so it is adequate but not complete.

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 only 50%, and the description adds no parameter meaning at all – it never mentions slug or the entrants array. The schema itself documents slug well and partially documents entrant fields, but the description does not compensate for the coverage gap.

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 names a specific verb and resource ('Add entries ... or checkpoints') and clarifies that the same tool targets two campaign types. It does not distinguish itself from siblings like add_judge, so it stops short of a 5.

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?

'Needs the organizer key' states a real precondition for invoking the tool, which is useful. However, there is no guidance on when to use this versus other add_* siblings or any exclusions, leaving usage largely implied.

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