flow-nexus-challenges

flow-nexus-challenges is a command for Claude Code from ruvnet/ruflo. It costs 14 tokens per session (667 once invoked), scanned A, original, MIT.

A set of commands for browsing coding challenges, submitting solutions, recording completed challenges, and viewing leaderboards.

In plain words
What is it for?
Use it to list challenges, inspect challenge details, submit code with a programming language, mark challenges complete, and view global leaderboards.
Why use it?
It gives coding practice a structured way to track submissions, test results, completion, and rankings.

Command for Claude Code

Part of the claude-flow plugin — 134 skills, 52 commands, 11 agents, 4 hooks shipped together

About the project

Ruflo is an execution and coordination layer for Claude Code and Codex that equips AI coding agents with tools, memory, control loops, sandboxes, and collaboration mechanisms. Developers use it to organize specialized agents into swarms, coordinate workflows, retain knowledge across sessions, and communicate across machines. The catalogue entries are Ruflo’s skills, commands, agents, hooks, and plugin components.

ruvnet/ruflo · 70,498 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/ruvnet/ruflo/challenges
Clone the repo
git clone --depth 1 https://github.com/ruvnet/ruflo

Made for: Claude Code.

Or install claude-flow, the plugin that ships this one along with the rest of its 134 skills, 52 commands, 11 agents, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for flow-nexus-challenges

README.md
[![agentmods](https://agentmods.dev/badge/commands/ruvnet/ruflo/challenges.svg)](https://agentmods.dev/commands/ruvnet/ruflo/challenges)
Your own site
<a href="https://agentmods.dev/commands/ruvnet/ruflo/challenges"><img src="https://agentmods.dev/badge/commands/ruvnet/ruflo/challenges.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 667 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00014 $0.00667
Opus 5 $0.00007 $0.00333
Sonnet 5 $0.00003 $0.00133
Haiku 4.5 $0.00001 $0.00067

Measured yesterday against content hash 5ab45467885d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

flow-nexus-challenges scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

7 near-identical copies found in the catalogue:

.claude/commands/flow-nexus/challenges.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flow Nexus Challenges

Complete coding challenges to earn rUv credits and climb the leaderboard.

List Challenges

mcp__flow-nexus__challenges_list({
  difficulty: "intermediate", // beginner, advanced, expert
  category: "algorithms",
  status: "active",
  limit: 20
})

Get Challenge Details

mcp__flow-nexus__challenge_get({
  challenge_id: "two-sum-problem"
})

Submit Solution

mcp__flow-nexus__challenge_submit({
  challenge_id: "challenge_id",
  user_id: "your_id",
  solution_code: `
    function solution(nums, target) {
      const map = new Map();
      for (let i = 0; i < nums.length; i++) {
        const complement = target - nums[i];
        if (map.has(complement)) {
          return [map.get(complement), i];
        }
        map.set(nums[i], i);
      }
      return [];
    }
  `,
  language: "javascript",
  execution_time: 45 // milliseconds
})

Complete Challenge

mcp__flow-nexus__app_store_complete_challenge({
  challenge_id: "challenge_id",
  user_id: "your_id",
  submission_data: {
    passed_tests: 10,
    total_tests: 10,
    execution_time: 45
  }
})

Leaderboards

// Global leaderboard
mcp__flow-nexus__leaderboard_get({
  type: "global", // weekly, monthly, challenge
  limit: 10
})

// Challenge-specific leaderboard
mcp__flow-nexus__leaderboard_get({
  type: "challenge",
  challenge_id: "specific_challenge",
  limit: 25
})

Achievements

mcp__flow-nexus__achievements_list({
  user_id: "your_id",
  category: "speed_demon" // Categories vary
})

rUv Credits

// Check balance
mcp__flow-nexus__ruv_balance({ user_id: "your_id" })

// View history
mcp__flow-nexus__ruv_history({
  user_id: "your_id",
  limit: 20
})

// Earn credits (automatic on completion)
mcp__flow-nexus__app_store_earn_ruv({
  user_id: "your_id",
  amount: 100,
  reason: "Completed expert challenge",
  source: "challenge"
})

Challenge Categories

  • algorithms: Classic algorithm problems
  • data-structures: DS implementation challenges
  • system-design: Architecture challenges
  • optimization: Performance challenges
  • security: Security-focused problems
  • ml-basics: Machine learning fundamentals

Read the full file on GitHub · 120 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 120 lines · 14 tokens per session scan A 5ab45467885d

Subscribe to this mod's changes

flow-nexus-challenges is a command published in the GitHub repository ruvnet/ruflo (70,498 stars, last pushed today), licensed MIT. It adds 14 tokens to every session and 667 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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