feature

feature is a skill for Claude Code, Codex from garagon/nanostack. It costs 45 tokens per session (1,215 once invoked), scanned A, original, Apache-2.0.

A shortcut for adding a known feature to an existing project through a complete development sprint.

In plain words
What is it for?
Planning and implementing a feature, such as importing JSON or CSV data to restore backups.
Why use it?
It skips an initial diagnostic phase when the desired change and the project are already clear.

Skill for Claude CodeCodex

Part of the nanostack plugin — 18 skills, 1 command 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/garagon/nanostack/feature
Any agent
npx skills add garagon/nanostack --skill feature
Clone the repo
git clone --depth 1 https://github.com/garagon/nanostack

Made for: Claude Code, Codex.

Or install nanostack, the plugin that ships this one along with the rest of its 18 skills, 1 command.

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/garagon/nanostack/feature.svg)](https://agentmods.dev/skills/garagon/nanostack/feature)
Your own site
<a href="https://agentmods.dev/skills/garagon/nanostack/feature"><img src="https://agentmods.dev/badge/skills/garagon/nanostack/feature.svg" alt="Measured on agentmods" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,215 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 $0.00045 $0.01215
Opus 5 $0.00023 $0.00607
Sonnet 5 $0.00009 $0.00243
Haiku 4.5 $0.00005 $0.00121

Measured 4d ago against content hash a8af859b5542, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

feature 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 4d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (bin/enforce-sprint.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.

feature/SKILL.md · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/feature — Add a Feature

Fast path for adding a feature to an existing project. Skips the /think diagnostic and runs the full sprint via skill invocations.

/feature Add import from JSON/CSV to restore backups

Telemetry preamble

Defensive telemetry init. No-op if telemetry is disabled via NANOSTACK_NO_TELEMETRY=1, ~/.nanostack/.telemetry-disabled, or if the helpers are removed.

_P="$HOME/.claude/skills/nanostack/bin/lib/skill-preamble.sh"
[ -f "$_P" ] && . "$_P" feature
unset _P

Setup

Before anything else, ensure the project is configured. Run this once (skips if already done):

[ -f .claude/settings.json ] || ~/.claude/skills/nanostack/bin/init-project.sh

Session

Initialize the sprint session with autopilot and explicit plan auto-approval. --autopilot already implies --plan-approval auto per the session contract, but passing it explicitly makes the intent obvious to anyone reading session.json.

~/.claude/skills/nanostack/bin/session.sh init feature --autopilot --plan-approval auto

Manual feature work should use /think + /nano instead. /feature itself does not accept a manual mode flag.

Then run session.sh phase-start plan. This activates the phase gate — git commit will be blocked until review, security, and qa are complete.

Process

You are an autonomous orchestrator. You run the entire sprint without stopping between phases. Do NOT wait for user input between steps. Do NOT ask "should I continue?" or "ready for review?". Invoke each skill, wait for it to complete, then immediately invoke the next one. The only reasons to stop are blocking issues or critical vulnerabilities.

Auto-approval contract for sub-skills. The session records plan_approval=auto and autopilot=true, so /nano, /review, /security, /qa, and /ship read those fields and behave accordingly: present briefly, do not pause for approval. If any of them asks "ready to proceed?", treat it as a regression in that skill, not a signal to stop.

Read the full file on GitHub · 129 lines

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.

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. 4d ago First seen · 129 lines · 45 tokens per session scan A a8af859b5542

Subscribe to this mod's changes

feature is a skill published in the GitHub repository garagon/nanostack (204 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 45 tokens to every session and 1,215 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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