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

Annotations already declare that this is a non-read-only, non-destructive, open-world mutation. The description adds the allowed status values and the partial-update behavior, but it does not explain permissions, validation rules, side effects of changing status to canceled, or whether changes are reversible.

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 two short sentences with no wasted words. The core action is front-loaded, and the partial-update instruction follows immediately.

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?

Given the low schema coverage, missing output schema, and mutation behavior, the description is adequate but thin. Annotations help establish safety, but the description should say more about permissions, expected return behavior, or consequences of status changes.

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 very low at 13%, so the description must compensate. It does add meaning for dates, points, status, and partial updates, but it omits name, description, and does not elaborate on competitionId beyond the schema's own note.

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 uses a specific verb, 'Changes', names the resource as a challenge, and lists the main editable dimensions: dates, points, and status. It is clear what the tool does, though it does not explicitly distinguish itself from siblings such as create_competition or get_competition.

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 phrase 'Send only what changes' gives useful partial-update guidance for this mutation tool. However, the description does not state when to use this tool versus create_competition, get_competition, or list_competitions, nor does it mention prerequisites or exclusions.

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