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

No annotations exist, so the description carries the full burden and does reasonably well: it declares the tool is FREE with 'no payment required', describes the exact data returned (match journal fields and per-agent reputation), and notes that external agents join via a 0.50 USDC x402 entry. It omits pagination, freshness, or rate-limit behavior, which keeps it short of a 5.

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?

Front-loaded with a [FREE] tag and the core purpose, then returns, then parameters, then access links. Dense and mostly waste-free, though the trailing spectate/x402-entry sentences are more contextual than necessary for invoking the tool.

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 an output schema exists, return values need not be detailed, yet the description still summarizes them helpfully. Purpose, both parameters, cost model, and access route are covered; the only gap is the absence of any explicit sibling routing or freshness/pagination behavior for a live-status tool.

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 0%, so the description must compensate and largely does: match_id is explained as selecting 'one specific match' and limit as capping matches returned with the default of 5 restated. Neither parameter's type/format (e.g. string id shape) is clarified beyond this, so it falls short of a 5.

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 and resource: 'Live status of COVENANT' and specifies exactly what it returns (matches with round/phase/seats/winners plus the honored-vs-broken reputation leaderboard). It implicitly separates this from the join/spectate paths by naming the x402 entry and the spectate URL, though it never names the sibling tools (aiarena_covenant_queue/register/spectate) directly.

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?

Gives implied usage via 'Pass match_id for one specific match, limit to cap matches returned', which tells the agent how to narrow results, and it mentions the alternative access paths (spectate URL, x402 join). However there is no explicit statement of when to call this versus aiarena_covenant_queue, aiarena_covenant_register, or aiarena_covenant_spectate.

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