What it does
Core capabilities at a glance
- AI Agents
- Anthropic
- Claude
- Claude Code
- Developer Tools
- MCP
- Productivity
Deep dive
The full breakdown - performance, comparisons, and setup
ECC
ECC is an agent framework - The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Overview
Use the guided setup or native plugin commands. Both install the same 'ecc@ecc' plugin. Choose one and do not stack a full manual Claude install on top.
OSS stays free. This repo is MIT-licensed forever. ECC Pro is the hosted GitHub App for private repos. Sponsors and Pro subscribers fund the work. That's why a single maintainer ships weekly across 7 harnesses.
Your agent can write code, but ECC gives it a coordinated engineering system and toolbox: it plans before it builds, verifies changes with tests, reviews its own work from a fresh context, remembers what matters, and turns repeated wins into reusable skills and workflows.
Instead of rebuilding that process in every prompt, you install it once and make it part of how your agent works.
ECC is MIT-licensed open source. It works best with Claude Code today, has a supported Codex sync path, and provides capability-limited adapters for Cursor, OpenCode, Gemini, Zed, GitHub Copilot, Antigravity, Qwen, and other harnesses. See the support status matrix before assuming feature parity.
Access to 68 agents, 292 skills, and 94 legacy command shims, plus hooks, rules, memory, continuous learning, and AgentShield security scanning. The agents are specialized for planning, review, build repair, security, architecture, and domain work.
ECC is open-source, written primarily in JavaScript, with 268,459 GitHub stars under the MIT license. The latest release is v2.2.1 (2026-09-08).
Key capabilities
From the project's documentation:
- Recommended default: run the guided Claude plugin setup above
- Also supported for Claude Code: use the native plugin commands
- Available in release 2.2: guided package setup for Claude Code, Codex, and Kimi Code
- Works: Claude Code plugin + Codex native plugin
- Works: Claude Code plugin + the legacy Codex sync flow
- Avoid: Claude Code plugin + full Claude manual install
How it fits a local-AI stack
ECC runs on your own hardware, so pair it with a model and a GPU sized to your needs. Use the VRAM calculator to pick a model that fits your card, and see what you can run for hardware guidance. Related agent frameworks in the directory:
Sources
- Source code & docs: affaan-m/ECC
- Official website: https://ecc.tools
Stats from GitHub, 2026-09-28.
Frequently asked
Quick answers to common questions
What is ECC?
ECC is a agent-framework tool for local AI workloads. The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor…
Is ECC free and open source?
Yes, ECC has 268,459 GitHub stars and is licensed under MIT. You can self-host it for free on .
What hardware do I need for ECC?
The hardware requirements depend on which models you run. Check our hardware directory for compatible GPUs and systems. ECC has 268,459 GitHub stars and an active community.
Does ECC support GPU acceleration?
ECC's GPU support depends on your specific setup. Check the documentation for details. For the best performance, pair it with an NVIDIA RTX 4090 or 5090.
What are the best alternatives to ECC?
Popular alternatives include other agent-framework tools in our directory. Browse our full collection at /tool for comparisons, community reviews, and benchmark data to find the right fit for your workflow.
How much does ECC cost?
ECC is free-open-source. It is completely free and open source to self-host.
Pairs well with
Complementary tools, models, and hardware