A version-check command that compares the installed add-on version with the version recorded in a project and reports whether they match.

Use it to see the plugin version, project version, and whether the project needs migration after an add-on update.

It makes version drift visible, so an outdated project configuration is less likely to cause confusing behavior or missed updates.

version — Skill by MountainUnicorn

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/mountainunicorn/add/version

Any agent

npx skills add MountainUnicorn/add --skill version

Clone the repo

git clone --depth 1 https://github.com/MountainUnicorn/add

Made for: Claude Code, Codex.

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 830 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.

Model	Per session	Once invoked
Fable 5	$0.00017	$0.00830
Opus 5	$0.00009	$0.00415
Sonnet 5	$0.00003	$0.00166
Haiku 4.5	$0.00002	$0.00083

Measured 2d ago against content hash 6b309f33d2fb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

version 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 2d 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.

core/skills/version/SKILL.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ADD Version Command v{{VERSION}}

Show the current ADD version, compare project config version to plugin version, and flag drift.

Execution

Read plugin version from ${CLAUDE_PLUGIN_ROOT}/ — try sources in order, first hit wins:
1. .claude-plugin/plugin.json → version field (Claude runtime)
2. plugin.toml → version field (Codex runtime)
3. VERSION (plain-text, single line — fallback for both runtimes)
On the Claude runtime, source 1 is authoritative and sources 2–3 are absent. On the Codex runtime (${CLAUDE_PLUGIN_ROOT} resolves to ~/.codex/add), source 1 is absent; read source 2 or 3. Never emit an error if source 1 is missing — fall through quietly.
Read project version from .add/config.json → version field (if file exists)
Read core/VERSION if accessible (development installs only)

Output

ADD Version
  Plugin:  v{plugin_version}
  Project: v{project_version}    (from .add/config.json)
  Status:  {status}

Status values:

Condition	Status	Action
project == plugin	`✓ Up to date`	None
project < plugin	`⚠ Project config is behind — migration will run on next skill invocation`	Suggest: "Run any /add: command to trigger auto-migration, or /add:init --reconfigure for a full refresh."
project > plugin	`⚠ Project config is ahead of plugin — you may be on an older plugin version`	Suggest: "Run: claude plugin update add@add-marketplace"
No .add/config.json	`○ Not an ADD project — run /add:init to get started`	—

--check flag

When invoked with --check, output a single machine-readable line and exit:

add:version plugin={plugin_version} project={project_version} status={up_to_date|behind|ahead|uninitialized}

This is for scripting and CI — e.g., a pre-commit hook that warns if the project version is stale.

Changelog summary (when behind)

If project < plugin and a CHANGELOG.md exists at the plugin or repo root, extract the version sections between the project version and the plugin version and display:

Read the full file on GitHub · 74 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.

2d ago First seen · 74 lines · 17 tokens per session scan A 6b309f33d2fb

Subscribe to this mod's changes

version is a skill published in the GitHub repository MountainUnicorn/add (11 stars, last pushed 1mo ago), licensed MIT. It adds 17 tokens to every session and 830 once invoked, about $0.0001 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.

Testing agent-driven-development ai-agents claude-code methodology plugin sdlc

version

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

ADD Version Command v{{VERSION}}

Execution

Output

--check flag

Changelog summary (when behind)

What this file has done since we first saw it

Other skills, from other repositories

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finish

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