A workstream branching tool that creates a new workstream from a copied context snapshot. The new workstream starts frozen at that point.

Use it to create a new workstream from an existing one with a chosen source and target name.

It lets you explore a separate line of work without changing the original context or bringing in its later transcript updates.

ctx-branch — Skill for Claude Code and Codex by dchu917/ctx

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.

Any agent

npx skills add dchu917/ctx --skill ctx-branch

Clone the repo

git clone --depth 1 https://github.com/dchu917/ctx

Made for: Claude Code, Codex.

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/dchu917/ctx/ctx-branch/github.svg)](https://agentmods.dev/skills/dchu917/ctx/ctx-branch)

Your own site

<a href="https://agentmods.dev/skills/dchu917/ctx/ctx-branch"><img src="https://agentmods.dev/badge/skills/dchu917/ctx/ctx-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/dchu917/ctx/ctx-branch"><img src="https://agentmods.dev/badge/skills/dchu917/ctx/ctx-branch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 91 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	$0.00019	$0.00091
Opus 5.5	$0.00008	$0.00036
Sonnet 5.5	$0.00004	$0.00018
Haiku 4.5	$0.00002	$0.00009

Measured 2mo ago against content hash 55d4ce38697d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ctx-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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/skills/ctx_branch.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/codex/ctx-branch/SKILL.md · 15 lines

What it actually says

Usage

ctx-branch <source-workstream> <target-workstream>

Backing script

scripts/skills/ctx_branch.sh

Notes

The target workstream must not already exist.
The new branch starts from a copied context snapshot and does not inherit the source workstream's future transcript pulls.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

scripts/skills/ctx_branch.sh 693 B runs code

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.

2mo ago First seen · 15 lines · 19 tokens per session scan A 55d4ce38697d

Subscribe to this mod's changes

ctx-branch is a skill published in the GitHub repository dchu917/ctx (127 stars, last pushed 6mo ago), licensed MIT. It adds 19 tokens to every session and 91 once invoked, about $0.0001 per session on Opus 5.5. 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.

Claude Code Planning Productivity cli codex context-management developer-tools sqlite

ctx-branch next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ctx-branchdchu917/ctx	Skill	127	6mo ago	MIT	A	19	Claude Code, Codex
alive:system-cleanupalivecontext/alive	Skill	132	1mo ago	MIT	A	52	Claude Code
alive:worldalivecontext/alive	Skill	132	1mo ago	MIT	A	63	Claude Code
alive:bundlealivecontext/alive	Skill	132	1mo ago	MIT	A	34	Claude Code
alive:settingsalivecontext/alive	Skill	132	1mo ago	MIT	A	84	Claude Code
alive-cleanupalivecontext/alive	Skill	132	1mo ago	MIT	A	20	Claude Code, Codex
alive-morningalivecontext/alive	Skill	132	1mo ago	MIT	A	24	Claude Code, Codex