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Install in OpenClaw
/install nccuoj
Description
Solve competitive programming problems on NCCUOJ (https://nccuoj.ebg.tw). Use when: solving OJ problems, reading problem statements, writing solutions in C/C...
Usage Guidance
This skill appears to be what it claims — it fetches problems and can submit/check solutions for NCCUOJ. Before installing or running it, consider:
- Password exposure: the examples use CLI arguments for username/password, which can be visible to other users/processes on the same machine; prefer typing credentials interactively or using a guarded mechanism if available.
- Cookie storage: session cookies are saved to .nccuoj/cookies.txt in the workspace; remove this file when you no longer want the session kept.
- Base URL override: an environment variable (NCCUOJ_BASE_URL) can redirect API calls — ensure it is not set to an untrusted host in your environment.
- Run in a trusted environment: because the scripts perform network operations and write files, run them in your expected workspace and review the scripts if you have concerns.
If you need stronger protections, consider creating a throwaway account for submissions and manually reviewing or sandboxing the scripts before use.
Capability Analysis
Type: OpenClaw Skill
Name: nccuoj
Version: 1.0.2
The skill bundle is a legitimate tool for interacting with the NCCUOJ competitive programming platform. It provides scripts (get_problem.py, submit.py, check_result.py) to fetch problems, submit solutions, and track results using the platform's API. While the scripts require user credentials for authenticated actions, they are passed via command-line arguments and used solely for the intended NCCUOJ endpoints, with no evidence of data exfiltration, malicious execution, or obfuscation.
Capability Assessment
Purpose & Capability
Name/description match the included Python scripts (get_problem, submit, check_result, session). All network calls target the NCCUOJ API and the stored files (.nccuoj/* and solution files) align with the described functionality.
Instruction Scope
SKILL.md instructs the agent to request usernames/passwords when needed and to run the included scripts. The scripts read/write only the .nccuoj workspace directory and call the NCCUOJ API. Note: the workflow instructs passing passwords as CLI arguments (exposed to the process list) and the scripts persist cookies to .nccuoj/cookies.txt; these are privacy/security considerations but are expected for a CLI-based OJ helper.
Install Mechanism
There is no install step or remote download. This is an instruction+script bundle using only Python stdlib. No external package installs or unknown URLs are used.
Credentials
The skill declares no required env vars. The code supports an override NCCUOJ_BASE_URL environment variable (useful for testing); this is reasonable but means a user or environment could redirect requests to a different server if set. Credentials are supplied at runtime (CLI args) rather than via a declared primary credential — this matches the described behavior but has the usual CLI-password exposure risk. The scripts persist session cookies locally (.nccuoj/cookies.txt), which is expected but worth noting.
Persistence & Privilege
always:false and the skill does not request system-wide changes or modify other skills. It creates/uses only its own .nccuoj directory for cookies and solution files (normal and scoped).
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install nccuoj - After installation, invoke the skill by name or use
/nccuoj - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.2
- Adds explicit workspace directory structure under `.nccuoj/`, organizing solutions and problem files for both public and contest problems.
- Updates all example commands to use an absolute `$SCRIPTS` path and clarifies that scripts should resolve their directory relative to the SKILL.md file.
- Instructs to always place solution code in the appropriate `.nccuoj/solution/public/` or `.nccuoj/solution/contest/` directory and references helper utilities for this.
- No changes to command syntax, API details, or solution templates.
v1.0.1
- Updated example script paths from `.github/skills/nccuoj/scripts/` to `scripts/` throughout all usage instructions
- No behavior or functional changes; only documentation and command path fixes for clarity and consistency
v1.0.0
- Initial release of the nccuoj skill for solving competitive programming problems on NCCUOJ.
- Supports fetching and reading problem statements (public and contest), writing and submitting solutions in C/C++/Python/Java/Go/JavaScript.
- Includes scripts for problem retrieval, code submission, and checking submission results; all scripts manage CSRF tokens and sessions automatically.
- Guides users through solving, testing, and debugging problems, and clarifies required credentials for private or contest problems.
- Provides language templates and details on usage for both public and contest problem-solving modes.
Metadata
Frequently Asked Questions
What is NCCU OJ?
Solve competitive programming problems on NCCUOJ (https://nccuoj.ebg.tw). Use when: solving OJ problems, reading problem statements, writing solutions in C/C... It is an AI Agent Skill for Claude Code / OpenClaw, with 269 downloads so far.
How do I install NCCU OJ?
Run "/install nccuoj" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is NCCU OJ free?
Yes, NCCU OJ is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does NCCU OJ support?
NCCU OJ is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created NCCU OJ?
It is built and maintained by andyjjrt (@andyjjrt); the current version is v1.0.2.
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