Ecc
Harness-native ECC workflows for Codex: shared skills, production-ready MCP configs, and selective-install-aligned conventions for TDD, security scanning, code review, and autonomous development.
- Type
- Plugin
- Repository
- affaan-m/ECC
- GitHub stars
- 268k
- License
- MIT
- Repo last updated
- Sep 24, 2026
- Source file
- .codex-plugin/plugin.json
- Version
- 2.2.2
- Author
- Affaan Mustafa
What Ecc is
Ecc is a plugin published in the affaan-m/ECC repository on GitHub, which has about 268k stars. The repository describes itself as: “The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.”
A plugin is a package that bundles skills, slash commands, subagents, hooks, and MCP connectors so they install together. Plugins are plain files with a manifest at .claude-plugin/plugin.json, and they work in both Claude Code and Claude Cowork.
Installing Ecc adds everything it ships in one step. Connectors inside a plugin still need to be connected separately, and hooks and subagents only run in Cowork and Claude Code, not in regular chat.
How to install Ecc
Claude Code
- Add the repository as a plugin marketplace: claude plugin marketplace add affaan-m/ECC
- Install the plugin: claude plugin install ecc@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json.
- Restart the session if the new skills or commands don't appear straight away.
Claude Cowork
- Open Customize → Plugins and choose Add marketplace.
- Enter affaan-m/ECC (the owner/repo shorthand works for GitHub).
- Find Ecc in the list, click Install, then connect any connectors it needs from its Connectors tab.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
We couldn't retrieve the source file for this entry. Browse the repository on GitHub to find it and read the README before installing.
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Ecc?
Ecc is a plugin for Claude Code and Claude Cowork from the affaan-m/ECC repository on GitHub. Harness-native ECC workflows for Codex: shared skills, production-ready MCP configs, and selective-install-aligned conventions for TDD, security scanning, code review, and autonomous development.
How do I install Ecc in Claude Code?
Add the repository as a plugin marketplace: claude plugin marketplace add affaan-m/ECC Install the plugin: claude plugin install ecc@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json. Restart the session if the new skills or commands don't appear straight away.
Can I use Ecc in Claude Cowork?
Open Customize → Plugins and choose Add marketplace. Enter affaan-m/ECC (the owner/repo shorthand works for GitHub). Find Ecc in the list, click Install, then connect any connectors it needs from its Connectors tab.
Is Ecc safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
Similar resources
- Network Architect Designs enterprise or multi-site network architecture from requirements, using existing network skills for focused routing, validation, automation, and troubleshooting detail. Subagent · affaan-m/ECC
- Network Config Reviewer Reviews router and switch configurations for security, correctness, stale references, risky change-window commands, and missing operational guardrails. Subagent · affaan-m/ECC
- Mle Reviewer Production machine-learning engineering reviewer for data contracts, feature pipelines, training reproducibility, offline/online evaluation, model serving, monitoring, and rollback. Use when ML, MLOps, model training, inference, feature store, or evaluation code changes. Subagent · affaan-m/ECC
- Loop Operator Operate autonomous agent loops, monitor progress, and intervene safely when loops stall. Subagent · affaan-m/ECC
- Ponytail Lazy senior dev mode. Forces the simplest, shortest solution that actually works: YAGNI, stdlib first, no unrequested abstractions. Plugin · DietrichGebert/ponytail
- Superpowers Core skills library for Claude Code: TDD, debugging, collaboration patterns, and proven techniques Plugin · obra/superpowers
- Ui Ux Pro Max UI/UX design intelligence for web, mobile, and desktop. This skill should be used when designing, building, reviewing, or fixing interfaces, including pages, components, design systems, accessibility, interaction, responsive layout, typography, color, charts, and stack-specific UI implementation. Searchable local data: 79 searchable styles (50 active), 192 product palettes and reasoning… Plugin · nextlevelbuilder/ui-ux-pro-max-skill
- Open Design Local-first design app · 139 skills + 150 DESIGN.md systems · exposes projects/files/preview tools to your coding agent over stdio MCP.… Plugin · nexu-io/open-design