ECC: An Open-Source Performance Harness and Operating System for AI Coding Agents

Developer affaan-m released ECC (Everything Claude Code), an open-source performance harness and operating system for AI coding agents such as Claude Code, Codex, and Cursor. ECC enforces a structured plan-test-implement-review-verify-remember-improve lifecycle through runtime hooks and prompt profiles, and bundles AgentShield, a security layer that audits prompt inputs, lifecycle hooks, MCP configurations, and credentials. The project also manages cross-session memory by pruning redundant conversation history while persisting architectural lessons and project conventions.

As command-line AI coding assistants such as Claude Code, Codex, and Cursor become daily engineering tools, developers often encounter the limits of single-turn prompting. Without an overarching engineering harness, agents tend to leap straight into code modifications—skipping architectural planning, neglecting test coverage, and failing to review changes against project conventions. ECC Everything Claude Code is an open-source performance harness and operating system developed by affaan-m. It provides AI coding agents with a coordinated engineering structure: enforcing rigorous development lifecycles, managing cross-session memory, and securing toolchain interactions. ECC acts as an intelligence coordination layer running directly inside your terminal agent. Rather than treating an agent as a simple script generator, ECC establishes a structured engineering workflow: plan ➔ test ➔ implement ➔ review ➔ verify ➔ remember ➔ improve By baking this lifecycle into the agent's runtime hooks and prompt profiles, developers get dependable, test-verified code with significantly less manual intervention. ECC bundles an extensive directory of pre-configured roles and engineering capabilities: As agents gain access to shell execution, MCP servers, and local file systems, security guardrails become mandatory. ECC includes AgentShield , which audits prompt inputs, lifecycle hooks, MCP configurations, and sensitive credentials for potential vulnerabilities. ECC manages context window utilization by pruning redundant conversational history while persisting high-value architectural lessons, project conventions, and bug-fix observations across sessions. ECC provides a streamlined guided installer supporting modern package managers: Recommended universal guided setup npx ecc-universal setup Or via Claude Code's native plugin manager /plugin marketplace add https://github.com/affaan-m/ECC /plugin install ecc@ecc By shifting AI coding from unstructured text prompting to a repeatable engineering process, ECC elevates coding assistants into disciplined software development partners. It is an indispensable harness for engineers building scalable software with autonomous agents. Want to supercharge your terminal coding assistant? Check out the ECC GitHub Repository https://github.com/affaan-m/ECC .