What is ac-git-branch?

A branch-creation helper for Git that also makes an empty specification folder and backlog file for the new branch.

It is for creating and checking out a named branch, creating its year-and-month specification directory, and committing the initial backlog file.

It keeps branch setup and the related planning files in a predictable structure, while stopping if the working copy is not clean.

ac-git-branch — Skill for Claude Code by WaterplanAI

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/WaterplanAI/agentic-config

agentmods

npx agentmods add skills/waterplanai/agentic-config/ac-git-branch

Made for: Claude Code.

Or install agentic-config, the plugin that ships this one along with the rest of its 49 skills, 1 plugin.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/waterplanai/agentic-config/ac-git-branch/github.svg)](https://agentmods.dev/skills/waterplanai/agentic-config/ac-git-branch)

Your own site

<a href="https://agentmods.dev/skills/waterplanai/agentic-config/ac-git-branch"><img src="https://agentmods.dev/badge/skills/waterplanai/agentic-config/ac-git-branch/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/waterplanai/agentic-config/ac-git-branch"><img src="https://agentmods.dev/badge/skills/waterplanai/agentic-config/ac-git-branch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 503 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00030	$0.00503
Opus 5	$0.00015	$0.00251
Sonnet 5	$0.00006	$0.00101
Haiku 4.5	$0.00003	$0.00050

Measured 9d ago against content hash 5e5685aad64c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

ac-git-branch 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 9d 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.

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.

packages/pi-ac-git/skills/ac-git-branch/SKILL.md · 69 lines

What it actually says

Create Branch with Spec Directory

Create a new git branch and its corresponding spec directory.

Pre-Flight Checks

Verify clean git state:
- If dirty: STOP and list uncommitted changes
Validate branch name:
- Must be provided as argument
- If empty: STOP with "Branch name required"

Execution

Create and checkout branch:
```
git checkout -b $ARGUMENTS
```

Resolve and create spec directory:

# Source the bundled spec resolver from this pi package
source "../../assets/scripts/spec-resolver.sh"

# Resolve spec path (handles external vs local)
RELATIVE_PATH="$(date +%Y)/$(date +%m)/$ARGUMENTS/000-backlog.md"
SPEC_FILE=$(resolve_spec_path "$RELATIVE_PATH")
SPEC_DIR="${SPEC_FILE%/*}"  # Pure bash dirname equivalent

# Create backlog file
touch "$SPEC_FILE"

Path: Auto-resolved based on .env configuration
- External: .specs/specs/<YYYY>/<MM>/<branch-name>/
- Local: specs/<YYYY>/<MM>/<branch-name>/
Creates 000-backlog.md (empty file)

Commit spec directory:

# Extract NNN and title for commit_spec_changes
# For backlog, use "000" and "backlog"
commit_spec_changes "$SPEC_FILE" "CREATE" "000" "backlog"

CRITICAL: Must commit BEFORE creating worktree, otherwise spec files are lost

Confirm:

- Branch: $ARGUMENTS
- Spec dir: <resolved-path>
- Backlog: 000-backlog.md (committed)

Conditional Documentation

When configuring external specs repository or modifying spec path resolution, read:

../../assets/scripts/spec-resolver.sh
../../assets/scripts/external-specs.sh
../../assets/scripts/lib/config-loader.sh

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.

9d ago First seen · 69 lines · 30 tokens per session scan A 5e5685aad64c

Subscribe to this mod's changes

ac-git-branch is a skill published in the GitHub repository WaterplanAI/agentic-config (30 stars, last pushed 1mo ago), licensed MIT. It adds 30 tokens to every session and 503 once invoked, about $0.0002 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.

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ac-git-branch