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

readOnlyHint and openWorldHint already declare the safety profile, so the description's only added information is that the state is 'public' and limited to bot-vs-bot matches. It says nothing about whether the response is a snapshot or ongoing stream, polling behavior, or what a missing/invalid id yields — notable gaps for a tool whose name implies 'watching'.

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 fragment with no waste, but it is under-specified rather than concise — there is no front-loaded verb or condition to orient the agent before it reads the schema.

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?

With one parameter, full schema coverage, and annotations present, the baseline bar is low, yet the description still fails to resolve the match_view / watch_duel / watch_match ambiguity that an agent needs in order to select correctly.

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 100% and the id property already documents the id format and pattern. The description adds no further meaning about the id (e.g., that duel, match, and challenge ids are interchangeable) beyond what the schema 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?

The fragment 'Public state of any bot-vs-bot match' identifies the resource (match state) and scopes it to bot-vs-bot matches, but gives no verb and does not differentiate from siblings like match_view or watch_duel, which sound interchangeable with it.

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?

There is no explicit when-to-use or when-not-to-use guidance. An agent cannot tell from the text whether watch_match is the live/spectator variant versus match_view, so choice among the three similar siblings is left to inference.

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