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

readOnlyHint=true and openWorldHint=false already establish the safety profile, so the description's job is lighter. It adds real value by disclosing the payload scope — both open and graded calls plus derived metrics (Brier score, calibration, streak, points) — so an agent knows this is a composite stats read rather than a raw call list.

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?

One compact sentence, front-loaded with the resource and followed by the enumerated contents. No filler, no restatement of the tool name.

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 no output schema, the description usefully enumerates the returned fields, and the read-only/single-filter shape is simple enough that little else is required. The remaining gap is positional: it doesn't clarify how this differs from the several other score/track-record tools in the sibling set.

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 carry the single `status` parameter, and it only obliquely does so via "every call open and graded." The enum values (all/open/graded) are largely self-explanatory, but the default behavior and what 'graded' implies for scoring are not spelled out.

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: fetching "this account's Owl Arena record," and enumerates the contents (open/graded calls, accuracy, Brier score, calibration, streak, $OWL points). It doesn't distinguish itself from overlapping siblings like get_owl_score, get_track_record, or arena_leaderboard, which an agent may conflate with this.

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?

"This account's" implies it is the personal/session-scoped view as opposed to arena_leaderboard or arena_markets, but that contrast is never made explicit. There is no statement of when to prefer this over get_track_record or get_owl_score, and no prerequisites mentioned.

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