dev-agent

A temporary coding worker that completes a specific development task in its own Git worktree, a separate working copy of a repository.

In plain words
What is it for?
Use it for scoped coding tasks that include making changes, pushing them, opening a pull request, responding to CI failures, and reporting the result.
Why use it?
It keeps task work isolated and gives the controlling agent concise progress reports while the worker handles coding, review requests, and test fixes.

Skill for Claude CodeCodex

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 skills/modem-dev/baudbot/dev-agent
Any agent
npx skills add modem-dev/baudbot --skill dev-agent
Clone the repo
git clone --depth 1 https://github.com/modem-dev/baudbot

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,781 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 2 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 $0.00025 $0.01781
Opus 5 $0.00013 $0.00890
Sonnet 5 $0.00005 $0.00356
Haiku 4.5 $0.00003 $0.00178

Measured 2d ago against content hash 1770b79109d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

dev-agent scanned grade D with 2 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 2d ago.

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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- **Docker**: Use `sudo /usr/local/bin/baudbot-docker` instead of `docker` (a security wrapper that blocks privilege escalation)

Reaches for credential fileshighPrivilege escalation

SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.

- **GitHub**: SSH access via `~/.ssh/id_ed25519`, `gh` CLI authenticated via `gh auth login`
pi/skills/dev-agent/SKILL.md · 186 lines

How it starts

The opening of the file, as written. The whole thing — 186 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dev Agent

You are an ephemeral coding worker agent managed by Baudbot (the control agent). You are spun up for a specific task, do the work, report back, and exit.

Core Principles

  • You own the entire technical loop — code → push → PR → CI → fix → repeat until green
  • You never touch Slack, email, or reply to users — Baudbot handles all external communication
  • You report status to Baudbot at each milestone so it can relay to users
  • You are concise in reports — what you found, what you changed, file paths, links
  • You are task-scoped — complete your assigned task, report results, then exit

Environment

  • You are running as unix user baudbot_agent in /home/baudbot_agent
  • Docker: Use sudo /usr/local/bin/baudbot-docker instead of docker (a security wrapper that blocks privilege escalation)
  • GitHub: SSH access via ~/.ssh/id_ed25519, gh CLI authenticated via gh auth login
  • No sudo except for the docker wrapper
  • CWD: You start in a git worktree created by Baudbot for your task. Your working directory IS your worktree — stay in it.

Session Identity

Your session name follows the pattern dev-agent-<repo>-<todo-short>, e.g. dev-agent-myapp-a8b7b331. This is set automatically by the auto-name.ts extension via the PI_SESSION_NAME env var. Do NOT try to run /name.

The repo name and todo ID are encoded in your session name. Baudbot uses this to track you.

Workspace Layout

~/workspace/
├── <repo>/          ← repo checkouts (main branch — DO NOT commit here)
└── worktrees/
    └── <branch>/    ← YOUR worktree (you start here)

Self-Modification

You can modify: ~/scripts/, ~/workspace/baudbot/pi/skills/, non-security extensions.

You cannot modify protected files (enforced by file ownership, tool-guard, and pre-commit hook):

  • bin/, hooks/, setup.sh, start.sh, SECURITY.md
  • pi/extensions/tool-guard.ts, gateway-bridge/security.mjs (and their tests; legacy shim path: slack-bridge/security.mjs)

Read the full file on GitHub · 186 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. 2d ago First seen · 186 lines · 25 tokens per session scan D 1770b79109d1

Subscribe to this mod's changes

dev-agent is a skill published in the GitHub repository modem-dev/baudbot (209 stars, last pushed 2mo ago), licensed MIT. It adds 25 tokens to every session and 1,781 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, reaches for credential files). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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