agentmods.dev

arn-code-save-plan

A planning workflow that turns a planning conversation into an organized, executable project. It creates phased implementation and testing plans, task lists, and progress tracking.

In plain words
What is it for?
Use it to save a plan, create project structure, divide work into phases, and prepare tasks for execution.
Why use it?
It converts informal ideas and decisions into files that can guide implementation and show what has been completed.

Skill for Claude CodeCodex

33 1mo ago A scan 98 tokens original MIT
View the source file AppsVortex/arness
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/appsvortex/arness/arn-code-save-plan
Any agent
npx skills add AppsVortex/arness --skill arn-code-save-plan
Clone the repo
git clone --depth 1 https://github.com/AppsVortex/arness

Made for: Claude Code, Codex.

Per session 98 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,037 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 $0.00098 $0.03037
Opus 5 $0.00049 $0.01519
Sonnet 5 $0.00020 $0.00607
Haiku 4.5 $0.00010 $0.00304

Measured yesterday against content hash ad76ab64cd8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

arn-code-save-plan 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 yesterday.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/save_plan.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.

plugins/arn-code/skills/arn-code-save-plan/SKILL.md · 231 lines

How it starts

The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Arness Save Plan

Convert a planning conversation into a structured, executable project with phased implementation plans, testing plans, task lists, and progress tracking.

This skill requires Arness to be configured in the target project. If Arness configuration is not found in the project's CLAUDE.md, the user should run /arn-planning to get started.

Workflow

Step 1: Check Arness Configuration

Read the project's CLAUDE.md and look for a ## Arness section. Also check for a legacy ## Arness Save Plan section (from earlier versions of this skill).

If ## Arness is found, extract:

  • Plans directory -- base path where project plans are saved
  • Specs directory -- path to the directory containing specification files
  • Report templates -- default or custom
  • Template path -- path to the report template set (JSON templates)
  • Template version -- plugin version the templates were copied from (if present)
  • Template updates -- user preference: ask, auto, or manual (if present)
  • Code patterns -- path to the directory containing stored pattern documentation

Validate that all paths exist on disk. If any path is missing, warn the user before proceeding.

Template Version Check

If the ## Arness section contains Template version and Template updates fields, compare the project's template version against the plugin version. If they differ, check for user modifications via checksums and either auto-update, prompt the user, or skip based on the configured preference. If ## Arness does NOT contain these fields, treat as legacy and skip.

Read ${CLAUDE_PLUGIN_ROOT}/skills/arn-code-save-plan/references/template-versioning.md for the full template version check procedure.

If legacy ## Arness Save Plan is found but no ## Arness, offer to migrate:

  1. Inform the user: "I found a legacy ## Arness Save Plan section. Arness now uses a unified ## Arness configuration section."
  2. Ask (using AskUserQuestion):

Read the full file on GitHub · 231 lines

Files

What ships with it

15 files 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. yesterday First seen · 231 lines · 98 tokens per session scan A ad76ab64cd8f

Subscribe to this mod's changes

arn-code-save-plan is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed 1mo ago), licensed MIT. It adds 98 tokens to every session and 3,037 once invoked, about $0.0005 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.

PlanningProductivityTestingai-workflowsclaude-codeclaude-code-plugindeveloper-toolsinfrastructure-as-codemcp
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