dev

A developer agent that handles software work from planning and critique through building, testing, review, fixes, documentation, and merging. It stays connected to the same engineering session across turns and restarts.

In plain words
What is it for?
Use it when a project manager needs an agent to carry a development task through its full software delivery process.
Why use it?
It keeps responsibility and context with one developer agent instead of repeatedly starting a new one for the same session.

Agent 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 agents/tomcounsell/ai/dev
Clone the repo
git clone --depth 1 https://github.com/tomcounsell/ai

Made for: Claude Code.

Per session 70 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,292 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin unknown 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 $0.00070 $0.01292
Opus 5 $0.00035 $0.00646
Sonnet 5 $0.00014 $0.00258
Haiku 4.5 $0.00007 $0.00129

Measured yesterday against content hash 362b67f1c525, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

dev scanned grade B with 1 finding 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.

Unrestricted tool accessmediumExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

tools: ['*']
.claude/agents/dev.md · 46 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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 · 46 lines · 70 tokens per session scan B 362b67f1c525

Subscribe to this mod's changes

dev is an agent published in the GitHub repository tomcounsell/ai (22 stars, last pushed 4d ago), licensed GPL-3.0. It adds 70 tokens to every session and 1,292 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.