AtCoder Client Skill

SkillDev tools

Interface with AtCoder for Japanese competitive programming contests

Instructions available. Your AI can read the instructions. Execution depends on the setup they require.

Account requirements not reviewed. Check the skill instructions before use; ahel provides instructions and does not run this skill.

Add ahel to your AI once: Claude, ChatGPT, Cursor, Claude Code or Codex. Then ask it to use this.

Then ask your AI: use the AtCoder Client Skill skill

What this skill tells your AI

The instructions your AI receives, as published by a5c-ai/babysitter in library/specializations/algorithms-optimization/skills/atcoder-client/SKILL.md and read by ahel’s review.

Purpose

Interface with AtCoder platform for accessing Japanese competitive programming contests, problems, and submissions.

Capabilities

Fetch contest problems with translations
Submit solutions and track results
Access AtCoder Problems difficulty ratings
Virtual contest participation
Retrieve user submission history
Access editorial content

Target Processes

atcoder-contest
progress-tracking
skill-gap-analysis

Integration

Uses AtCoder web interface and AtCoder Problems API for difficulty ratings and problem metadata.

Input Schema

{
  "type": "object",
  "properties": {
    "action": {
      "type": "string",
      "enum": ["getContestProblems", "getProblem", "getSubmissions", "getDifficulty", "getUserStats"]
    },
    "contestId": { "type": "string" },
    "problemId": { "type": "string" },
    "username": { "type": "string" }
  },
  "required": ["action"]
}

Output Schema

{
  "type": "object",
  "properties": {
    "success": { "type": "boolean" },
    "data": { "type": "object" },
    "error": { "type": "string" }
  },
  "required": ["success"]
}

Usage Example

{
  "action": "getContestProblems",
  "contestId": "abc300"
}

Signals

GitHub stars: 2k
Forks: 112
Last commit: Sep 2026

Advanced

Item type: skill
Key: atcoder-client
Source: github.com/a5c-ai/babysitter

github.com/a5c-ai/babysitter