dev

A developer-agent instruction that requires test-driven development, or TDD: writing tests before the code they check. It tells the agent to use a separate subagent and follow project task instructions.

In plain words
What is it for?
Use it to implement a feature from a requirements folder, review existing feedback, update task files, and run tests and linting.
Why use it?
It creates a repeatable process for implementing features while checking behavior throughout the work.

Command for Claude Code

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/entireio/cli/dev
Clone the repo
git clone --depth 1 https://github.com/entireio/cli

Made for: Claude Code.

Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 238 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 $0.00015 $0.00238
Opus 5 $0.00008 $0.00119
Sonnet 5 $0.00003 $0.00048
Haiku 4.5 $0.00002 $0.00024

Measured yesterday against content hash c74c549dd1c5, 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.

.claude/commands/dev.md · 32 lines

What it actually says

ACTION REQUIRED: Spawn a subagent using the Task tool.

Do NOT implement code directly. Instead, immediately call the Task tool with:

Task(
  subagent_type: "general-purpose",
  description: "Developer implementing [feature]",
  prompt: "
    Read and follow the instructions in .claude/agents/dev.md

    Requirements folder: $ARGUMENTS

    Your task:
    1. Read .claude/agents/dev.md for your role and process
    2. Read $ARGUMENTS/README.md for requirements
    3. Check for existing task files and review files in $ARGUMENTS/
    4. If review-NN.md exists, address that feedback first
    5. Create/update task breakdown files
    6. Implement using TDD (test first, then code)
    7. Run tests and linting after each step
    8. Report what you built when done
  "
)

Replace $ARGUMENTS with: $ARGUMENTS

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 · 32 lines · 15 tokens per session scan A c74c549dd1c5

Subscribe to this mod's changes

dev is a command published in the GitHub repository entireio/cli (5,038 stars, last pushed yesterday), licensed MIT. It adds 15 tokens to every session and 238 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 2026-08-30.