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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds value by stating 'Read-only, public' and by disclosing the ordering ('newest first') and the inclusion of running BLUE/RED win counts, which are behavioral details not present in the annotations or schema.

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 a single sentence that front-loads the core purpose, then adds the most important behavioral details (ordering, win counts, read-only, public). Every word earns its place; there is no fluff or repetition of the title.

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?

For a simple read-only list tool with two optional parameters and no output schema, the description is nearly complete. It covers what is returned, the ordering, and the access level. The only minor gap is that it doesn't describe the exact return format or pagination behavior beyond the offset parameter, but the schema covers the pagination parameters and the tool's simplicity lowers the burden.

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 the schema already documents both parameters (limit and offset) with ranges and defaults. The description does not add parameter-specific meaning beyond what the schema provides, which is acceptable given the high coverage. Baseline 3 is appropriate.

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 states a specific verb ('get'), a specific resource ('arena epoch history'), and the key content (winners, draws, failed epochs, BLUE/RED win counts). It also specifies ordering ('newest first'), which distinguishes it from other arena tools like get_arena_epoch, get_arena_state, and get_arena_teams.

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 description clearly indicates this is a read-only public history endpoint, which implies it is safe to call without special permissions. It does not explicitly name alternatives or when-not-to-use, but the sibling list contains related arena tools (get_arena_epoch, get_arena_state, get_arena_teams) and the description's specificity about history vs state/teams provides enough context for an agent to select it.

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