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

With no annotations, the description must carry the full burden of behavioral disclosure. It mentions how to identify players (name, numeric id, or 6-character code), but does not disclose side effects such as overwriting existing results, permission requirements, or error behavior. For a state-changing tool, this is a significant gap.

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 sentences, front-loading the purpose first and following with essential details. No filler words; every sentence earns its place.

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 no annotations and no output schema, the description should explain behavior more thoroughly. It omits what 'round' means, does not address side effects or prerequisites, and gives no indication of what happens on success or failure. For a 7-parameter mutation tool, this is incomplete.

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 0%, so the description must explain parameters. It clarifies player_a/player_b (identification methods), sets_a/sets_b (set score), and games (optional games), but the 'round' parameter is not mentioned. This leaves one parameter undefined, so it partially compensates but is not complete.

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 the action ('Record a finished match result') with a specific resource and scope. It distinguishes itself from siblings like schedule_match (scheduling) and get_standings (querying), leaving no ambiguity about the tool's function.

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 'finished match result' implies the tool is for completed matches, which indirectly separates it from scheduling tools, but no explicit guidance is given for when to use this versus alternatives or when not to use it. The context is implied rather than stated.

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