# Atcoder Client

> Interface with AtCoder for Japanese competitive programming contests

- Skill: `a5c-ai/atcoder-client` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add a5c-ai/atcoder-client`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/atcoder-client/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/atcoder-client

---


# AtCoder Client Skill

## 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

```json
{
  "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

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

## Usage Example

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