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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=true, so the safety profile is covered. The description adds behavioral specifics meaningful to an agent: the handles filter is applied client-side after fetching because Codeforces rejects the upstream filter, and gym contests are off-limits without credentials. It also describes exactly what data will be returned. Only minor gaps remain, such as pagination rate limits.

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 compact and front-loaded with the core purpose, followed by supporting detail in a single flowing paragraph. It uses concrete examples of answers it can provide. It could be slightly tightened by moving the examples into a clearer sentence break, but it remains efficient and informative without redundancy.

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 read-only tool with a rich output schema and 100% parameter schema coverage, the description is complete. It tells the agent what the result contains, what type of contests are supported, and how the handles filter behaves. The only possible omission is rate-limit guidance, but that's not essential given the annotations and schema.

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%, so all four parameters are already well-documented in the schema. The description adds a bit of context about what 'handles' filtering does and the gym/contest_id limitation, but mostly the schema carries the parameter documentation load. No additional parameter semantics are needed beyond the schema.

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 identifies the resource: the final scoreboard of a specific Codeforces round, enumerating its contents (participants' rank, handle, points, penalty, hacks, per-problem results, contest metadata, problem list with ratings/tags). It answers specific sample questions (who won, where a handle placed, which problems the round contained), making it distinguishable from sibling tools like contest_list, problemset, and user_status.

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 implies when this tool is useful by listing the kinds of questions it answers. The schema adds important usage context: contest_id must be a non-gym contest and gym contests are excluded due to missing auth. However, the main description doesn't explicitly contrast it with sibling tools (e.g., contest_list for listing rounds, problemset for problem data without standings, recent_actions for recent activity).

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