dev

A command that coordinates a complete feature-development process: explore the codebase, create a plan, implement the work with TDD, and document the result. TDD means writing tests around expected behavior as part of development.

In plain words
What is it for?
Use it for end-to-end development tasks that need codebase exploration, implementation planning, test-driven execution, and feature documentation.
Why use it?
It gives a single workflow for moving from a written request to a tested feature. The exploration and planning stages help the implementation fit the existing project.

Command

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/ruslan-korneev/claude-plugins/dev
Clone the repo
git clone --depth 1 https://github.com/ruslan-korneev/claude-plugins
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,499 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 $0.00027 $0.01499
Opus 5 $0.00014 $0.00749
Sonnet 5 $0.00005 $0.00300
Haiku 4.5 $0.00003 $0.00150

Measured yesterday against content hash ff3c81c5ca66, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev 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.

plugins/tech-lead/commands/dev.md · 234 lines

How it starts

The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Full Development Cycle Command

This command orchestrates the complete TDD development workflow: explore → plan → execute.

Workflow

┌─────────────────────────────────────────────────────────────────┐
│                     /dev:cycle "{prompt}"                       │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│ PHASE 1: EXPLORE                                                │
│                                                                 │
│ Agent: codebase-explorer (sonnet - fast)                        │
│ Task: Find relevant modules and understand project structure    │
│                                                                 │
│ Output:                                                         │
│ - Project structure analysis                                    │
│ - Relevant file paths                                           │
│ - Patterns to follow                                            │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│ PHASE 2: PLAN                                                   │
│                                                                 │
│ Agent: planning-agent (opus - deep analysis)                    │
│ Task: Create detailed development plan with test cases          │
│                                                                 │
│ Actions:                                                        │
│ - Deep analysis of relevant files                               │
│ - Ask clarifying questions (AskUserQuestion)                    │
│ - Create plan with Memory Anchors                               │
│ - Save to .claude/plans/dev-{slug}.md                           │
│                                                                 │
│ Output:                                                         │
│ - Development plan file                                         │
│ - Ordered test cases                                            │
│ - Implementation steps                                          │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│ PHASE 3: APPROVE                                                │
│                                                                 │
│ Action: EnterPlanMode                                           │
│ Task: User reviews and approves the plan                        │
│                                                                 │
│ User sees:                                                      │
│ - Summary of changes                                            │
│ - Files to be created/modified                                  │
│ - Test cases to implement                                       │
│                                                                 │
│ User action: Approve or request changes                         │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│ PHASE 4: EXECUTE                                                │
│                                                                 │
│ Agent: execution-agent (opus - full control)                    │
│ Task: Implement using TDD (Red-Green-Refactor)                  │
│                                                                 │
│ For each test case:                                             │
│ 1. RED: Create failing test (pytest-assistant:first)            │
│ 2. GREEN: Write minimal implementation                          │
│ 3. REFACTOR: Improve code (clean-code:review)                   │
│ 4. QUALITY: Verify lint & types pass                            │
│                                                                 │
│ Output:                                                         │
│ - Implemented feature with tests                                │
│ - Updated plan status                                           │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│ PHASE 5: COMPLETE                                               │
│                                                                 │
│ Final actions:                                                  │
│ - Run full test suite                                           │
│ - Verify all quality gates                                      │
│ - Update plan status to "completed"                             │
│ - Suggest commit message                                        │
└─────────────────────────────────────────────────────────────────┘

Read the full file on GitHub · 234 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 · 234 lines · 27 tokens per session scan A ff3c81c5ca66

Subscribe to this mod's changes

dev is a command published in the GitHub repository ruslan-korneev/claude-plugins (4 stars, last pushed 6mo ago), licensed MIT. It adds 27 tokens to every session and 1,499 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 2026-08-31.