feature-open

feature-open is a command for Claude Code from jayvee/aigon. It costs 9 tokens per session (498 once invoked), scanned A, a copy of afo, Apache-2.0.

A command that opens an isolated Git worktree—a separate working folder for one feature—in a terminal and starts a selected coding agent.

In plain words
What is it for?
Use it to open the latest or a specified feature worktree and start Claude Code, Cursor, Antigravity, or Codex in it.
Why use it?
It avoids manually finding the worktree and launching the agent, making parallel feature work easier to start.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions Claude Code; mentions Codex.

Good fit Use it to open the latest or a specified feature worktree and…

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Install with agentmods
npx agentmods add commands/jayvee/aigon/feature-open
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.

Clone the repo
git clone --depth 1 https://github.com/jayvee/aigon

Made for: Claude Code.

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 feature-open

README.md
[![agentmods](https://agentmods.dev/badge/commands/jayvee/aigon/feature-open.svg)](https://agentmods.dev/commands/jayvee/aigon/feature-open)
Your own site
<a href="https://agentmods.dev/commands/jayvee/aigon/feature-open"><img src="https://agentmods.dev/badge/commands/jayvee/aigon/feature-open.svg" alt="Measured on agentmods" height="20"></a>
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 498 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 100% copy Near-identical to another mod 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 $0.00009 $0.00498
Opus 5 $0.00005 $0.00249
Sonnet 5 $0.00002 $0.00100
Haiku 4.5 $0.00001 $0.00050

Measured 3d ago against content hash b85fc129e3e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

feature-open 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 3d 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.

Origin

This is a copy

100% identical to afo — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/commands/aigon/feature-open.md · 58 lines

What it actually says

feature-open

Open a feature worktree in terminal and automatically start the AI agent with /aigon:feature-do.

Usage

/aigon:feature-open [feature-id] [agent-code]
  • /aigon:feature-open — open the most recently created worktree
  • /aigon:feature-open 77 — open any worktree for feature 77
  • /aigon:feature-open 77 cx — open specifically the cx (Codex) worktree for feature 77

Agent Mappings

Code Agent Command Mode
cc Claude Code claude --permission-mode acceptEdits Auto-edits, prompts for risky Bash
cu Cursor agent --force Auto-approves commands (yolo mode)
ag Antigravity agy --dangerously-skip-permissions Auto-approves all
cx Codex codex --full-auto Workspace-write, smart approval

Safe in worktrees since you can always git reset --hard.

Permission Tips

When an agent asks for permission, here's how to quickly allow:

Agent Allow once Allow always Toggle full-auto
Claude Code Press Enter at prompt Choose "Always allow" at prompt Shift+Tab cycles modes
Cursor Click "Run" Click "Add to allowlist" Enable YOLO in settings
Codex Approve at prompt "Allow and remember" (session) /mode command

Step 1: Run the CLI command

aigon feature-open {{args}}

This will:

  1. Find the matching worktree
  2. Create a Warp launch configuration
  3. Open Warp with the worktree directory
  4. Auto-run the agent CLI with /aigon:feature-do <ID>

Step 2: Confirm to user

Tell the user:

  • Which worktree was opened
  • Which agent was launched with which feature ID
  • That the agent should start implementing automatically
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. 3d ago First seen · 58 lines · 9 tokens per session scan A b85fc129e3e7

Subscribe to this mod's changes

feature-open is a command published in the GitHub repository jayvee/aigon (25 stars, last pushed 6d ago), licensed Apache-2.0. It adds 9 tokens to every session and 498 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to afo, differing in 2 lines, and is treated as a copy.