What is plugin-installer?

A plugin installation tool that places agent components in a central .agents store and links them into environments such as Claude and Gemini.

Use it to install plugins from GitHub or a local folder, choose selected skills, or perform non-interactive installations in CI.

It avoids installing and maintaining separate copies of the same skills, commands, workflows, rules, hooks, and MCP components.

plugin-installer — Skill for Claude Code by richfrem

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/richfrem/agent-plugins-skills

agentmods

npx agentmods add skills/richfrem/agent-plugins-skills/plugin-installer

Made for: Claude Code.

Or install plugin-manager, the plugin that ships this one along with the rest of its 3 skills.

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/richfrem/agent-plugins-skills/plugin-installer/github.svg)](https://agentmods.dev/skills/richfrem/agent-plugins-skills/plugin-installer)

Your own site

<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/plugin-installer"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/plugin-installer/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/richfrem/agent-plugins-skills/plugin-installer"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/plugin-installer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 112 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 668 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	$0.00112	$0.00668
Opus 5.5	$0.00045	$0.00267
Sonnet 5.5	$0.00022	$0.00134
Haiku 4.5	$0.00011	$0.00067

Measured 13d ago against content hash 8b49ec057a0d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

plugin-installer 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 13d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/plugin_add.py, scripts/plugin_installer.py), 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/plugin-manager/skills/plugin-installer/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plugin Installer (plugin-installer)

Deploys agent plugins and skills into the .agents/ central store and symlinks them across agent environments.

Critical Constraints
Quick start
Workflow
Verification
References

Critical Constraints

Scope Boundary: Dedicated to installing newly added plugins. For refreshing or syncing existing registered plugins, use plugin-syncer.
Ownership State Tracking: Every install creates or updates .agents/ownership/<plugin>.json tracking component-level should_install desired states.
Preserve Disabled Selections: Default installation respects existing user disables unless --enable-all is explicitly passed.
Direct Symlinks: Symlinks generated into agent environments (.claude/, .gemini/) must link directly to .agents/ store without symlink chaining.

Quick start

# Interactive installation with multiselect menu
python3 plugins/plugin-manager/scripts/plugin_add.py

# Install all components non-interactively
python3 plugins/plugin-manager/scripts/plugin_add.py plugins/ --all -y

Workflow

Phase 1: Source Discovery: Validate target source (local path or GitHub owner/repo) and inspect plugin manifest.
Phase 2: Ownership Manifest Generation: Record .agents/ownership/<plugin>.json defining enabled components and mapped artifacts.
Phase 3: Central Store Provisioning: Deploy assets into the .agents/ central primitive directories.
Phase 4: Agent Environment Symlinking: Symlink deployed primitives into IDE-specific environments (.claude/, .gemini/).

Verification

# Verify environment symlink health
python3 plugins/dev-utils/scripts/symlink_manager.py audit

# Audit skill compliance
python3 plugins/agent-scaffolders/scripts/audit_skill.py plugins/plugin-manager/skills/plugin-installer --mode source

References

installer-cli-guide.md - CLI parameters, flags, and multi-IDE mappings.
plugin_installer_overview.md - Bridge pattern architecture and repository layout.
acceptance-criteria.md - Structural invariants and verification checklist.
fallback-tree.md - Environmental recovery and fallback procedures.

Read the full file on GitHub · 62 lines

Files

What ships with it

12 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.

13d ago Changed · -1 lines 8b49ec057a0d
18d ago Changed · +2 lines · +42 tokens per session 9cf6b7c60a14
29d ago First seen · 61 lines · 70 tokens per session scan A 74291cfba17e

Subscribe to this mod's changes

plugin-installer is a skill published in the GitHub repository richfrem/agent-plugins-skills (7 stars, last pushed yesterday), licensed MIT. It adds 112 tokens to every session and 668 once invoked, about $0.0004 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 2026-09-17.

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plugin-installer