everything-claude-code

Free

The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.

Model APIsFreeFree tier

Type

Open Source

Visit Website GitHub (172.4k stars)

About everything-claude-code

ECC Tools is an open-source agent harness system that enhances coding agents like Claude Code, Codex, Cursor, and OpenCode. It provides a three-layer architecture: a distribution layer with 261 skills, 64 agents, and 84 commands; a protection layer featuring AgentShield with 102 security rules; and a control-plane layer (ECC 2.0) for observability, orchestration, and session management. The GitHub App integrates with repositories to turn history into reusable skills and defaults, enabling automated PR scanning, workflow audits, and policy enforcement. Used by thousands of developers and Fortune 500 teams, ECC is MIT-licensed and offers free, Pro ($19/seat/month), and Enterprise plans.

Key Features

261 skills, 64 agents, and 84 commands in the OSS layer

102 security rules (AgentShield) scan every agent session

GitHub App that turns repo history into reusable skills and defaults

Works across Claude Code, Codex, Cursor, and OpenCode

Three-layer architecture: distribution (OSS), protection (AgentShield), control-plane (ECC 2.0)

ECC 2.0 operator surface for session management and cross-harness operations

MIT-licensed open-source repository

Free, Pro ($19/seat/month), and Enterprise pricing tiers

Pros & Cons

Pros

Fully open-source with MIT license, no vendor lock-in
Multi-harness support (Claude Code, Codex, Cursor, OpenCode) under one system
AgentShield provides real-time security scanning for agent sessions
GitHub App automates continuous integration of repository patterns
Large community with 210K+ GitHub stars and active Discord

Cons

Free GitHub App tier limited to public repo analysis and 10 analyses per month
Pro tier at $19/seat/month may be costly for large teams
Enterprise features like SSO, custom rules, and governance require contacting sales
Three-layer architecture may be complex for new users to understand

Best For

Automated PR scanning and review with context from repo conventionsSecurity audits of repository workflows and risky configurationsExtracting team patterns from commit history as reusable skillsBuilding custom agent profiles for developer, security, or full-stack needsCross-harness orchestration and session visibility across multiple AI coding tools

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FAQ

What is ECC Tools?

ECC Tools is an open-source agent harness system that optimizes the performance of coding agents like Claude Code, Codex, Cursor, and OpenCode. It adds skills, instincts, memory, security scanning, and a GitHub App for repository automation.

Is ECC Tools free?

The ECC OSS layer is always free. The GitHub App offers a Free tier for public repos with limited analyses, a Pro tier at $19/seat/month for private repos and automation, and an Enterprise tier with custom pricing.

What is AgentShield?

AgentShield is the protection layer of ECC that scans every agent session with 102 security rules to detect risky configurations, policy violations, and unsafe patterns. It is available as an open-source scanner and via the GitHub App.

Which coding agents does ECC support?

ECC works across Claude Code, Codex, Cursor, and OpenCode, with adapters and hooks for each harness.

How does the GitHub App work?

After installing ECC on a GitHub repo or org, you comment '/ecc-tools analyze' to inspect workflow patterns, repo conventions, and risky configs. The app generates a pull request with recommendations that can be merged to add reusable skills and defaults.