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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered. The description adds nothing on top: it does not warn that repeated calls create duplicate entries (non-idempotent) or that this mutates tournament state.

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?

A single short sentence with zero wasted words and the action front-loaded. It is efficient, though arguably too sparse rather than excessively long.

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?

This is a non-idempotent, destructive write with four required parameters and no output schema; the description should at least note duplicate-entry behavior or dependencies on a pre-existing tournament. As written, an agent has enough to attempt the call but not enough to use it safely.

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 four parameters (team name, seed, session_token, tournament_id) are documented in the schema. The description's 'team/participant' phrasing marginally clarifies what 'name' means but adds no format or constraint detail beyond the schema, so the baseline 3 applies.

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 specific verb ('Add') and resource ('team/participant to a tournament'), which is enough to distinguish it from siblings like add_court or create_tournament. It is clear but does not explicitly contrast itself with any alternative sibling.

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?

No when-to-use guidance, no prerequisites, and no mention that a tournament must already exist or that the session_token must come from create_tournament (only the schema says that). The agent gets no help deciding between add_entry and alternatives.

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