blocklet-branch

blocklet-branch is a skill for Claude Code from ArcBlock/agent-skills. It costs 43 tokens per session (2,597 once invoked), scanned A, original, MIT.

A Git branch management tool that detects a repository’s main working branch and branch-naming style from its history instead of assuming names such as main or master.

In plain words
What is it for?
Use it to inspect repository and remote details, determine branch conventions, create branches, and switch branches safely.
Why use it?
It helps avoid creating or switching to the wrong branch in repositories with different conventions, while accounting for uncommitted changes.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: names the AskUserQuestion tool; positional $N argument.

Part of the blocklet plugin — 8 skills shipped together

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/arcblock/agent-skills/blocklet-branch
Any agent
npx skills add ArcBlock/agent-skills --skill blocklet-branch
Clone the repo
git clone --depth 1 https://github.com/ArcBlock/agent-skills

Made for: Claude Code.

Or install blocklet, the plugin that ships this one along with the rest of its 8 skills.

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.

agentmods badge for blocklet-branch

README.md
[![agentmods](https://agentmods.dev/badge/skills/arcblock/agent-skills/blocklet-branch.svg)](https://agentmods.dev/skills/arcblock/agent-skills/blocklet-branch)
Your own site
<a href="https://agentmods.dev/skills/arcblock/agent-skills/blocklet-branch"><img src="https://agentmods.dev/badge/skills/arcblock/agent-skills/blocklet-branch.svg" alt="Measured on agentmods" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,597 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 5.1 $0.00043 $0.02597
Opus 5 $0.00022 $0.01299
Sonnet 5 $0.00009 $0.00519
Haiku 4.5 $0.00004 $0.00260

Measured 6d ago against content hash 5537172e5780, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

blocklet-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 6d 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.

plugins/blocklet/skills/blocklet-branch/SKILL.md · 359 lines

How it starts

The opening of the file, as written. The whole thing — 359 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Blocklet Branch

Unified Git branch management tool providing branch detection, creation, and switching capabilities.

Core Philosophy

"Detect dynamically, never assume."

Branch management must not hardcode main or master. Different ArcBlock repositories follow different branch conventions. By analyzing PR history dynamically, branch operations adapt to each repository automatically.

Design Principles

  • Never assume the main branch is main or master; detect dynamically through merged PR history
  • Learn branch naming conventions from project history
  • Must handle uncommitted changes before switching branches

1. Repository Information Retrieval

1.1 Parse Remote Repository

REMOTE_URL=$(git remote get-url origin)

# Parse org/repo
ORG=$(echo $REMOTE_URL | sed -E 's/.*[:/]([^/]+)\/([^/]+)(\.git)?$/\1/')
REPO=$(echo $REMOTE_URL | sed -E 's/.*[:/]([^/]+)\/([^/]+)(\.git)?$/\2/' | sed 's/\.git$//')

echo "Repository: $ORG/$REPO"

1.2 Get Current Branch

CURRENT_BRANCH=$(git branch --show-current)
echo "Current branch: $CURRENT_BRANCH"

2. Main Iteration Branch Detection

Important: Must determine the main iteration branch by analyzing the last 10 merged PRs, rather than simply assuming it is main or master.

2.1 Detect Main Iteration Branch

# Get target branches of the last 10 merged PRs, count occurrences to find the main iteration branch
MAIN_BRANCH=$(gh pr list --repo $ORG/$REPO --state merged --limit 10 --json baseRefName \
  | jq -r '.[].baseRefName' | sort | uniq -c | sort -rn | head -1 | awk '{print $2}')

# Get detection rationale
BRANCH_STATS=$(gh pr list --repo $ORG/$REPO --state merged --limit 10 --json baseRefName \
  | jq -r '.[].baseRefName' | sort | uniq -c | sort -rn)

echo "Main iteration branch: $MAIN_BRANCH"
echo "Detection rationale (target branch statistics from last 10 merged PRs):"
echo "$BRANCH_STATS"

2.2 Output Variables

Variable Description Example
MAIN_BRANCH Detected main iteration branch main, develop, master
MAIN_BRANCH_REASON Detection rationale "8 out of 10 recent merged PRs targeted main"

Read the full file on GitHub · 359 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. 6d ago First seen · 359 lines · 43 tokens per session scan A 5537172e5780

Subscribe to this mod's changes

blocklet-branch is a skill published in the GitHub repository ArcBlock/agent-skills (5 stars, last pushed 5d ago), licensed MIT. It adds 43 tokens to every session and 2,597 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 2026-08-31.

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