ECC 2.0.0 — The Agent Harness Operating System

ECC 2.0.0 is the stable graduation of the 2.0 line: ECC as a cross-harness operating system for agentic work. Claude Code stays first-class; Codex, OpenCode, Cursor, Gemini, Zed, and terminal-only workflows share the same skills, rules, hooks, MCP conventions, release gates, and operator workflows. This is the months-in-the-making release the rc.1 candidate was building toward.

The control pane (early build)

The ECC 2.0 operating surface, running locally (node scripts/control-pane.js): operator recall search, live session metrics, a work-items board with ready/running/blocked/done lanes, and an operator column that drives knowledge sync/recall, graph backfill, and the TUI. The session adapters and MCP inventory below feed this board. Build-in-public continues in the Discord #control-pane channel.

What is new

• 261 public skills across coding, research, security, media, enterprise ops, and agent workflows (rc.1 shipped 243) — plus 64 agents and 84 commands.
• The control-pane substrate — the foundation of the ECC 2.0 operating surface:
• harness-neutral session adapters (ecc.session.v1) covering Claude Code, Codex, OpenCode, and dmux — one schema for "which agent is where, doing what"
• MCP inventory (ecc.mcp.v1) — one normalized view of every MCP server config across harnesses, with fragmentation/drift detection and secret redaction (it caught a real arg-carried key leak during development)
• worktree-lifecycle service — deterministic merge-conflict prediction and safe GC for parallel agent worktrees
• orch-* orchestrator skill family plus dynamic workflow team orchestration — multi-agent fan-out as a first-class surface.
• Single-connector MCP default policy — the default set is now exactly one connector (chrome-devtools); the other six retired to opt-in after a June 2026 audit. Policy + per-connector rationale: docs/MCP-CONNECTOR-POLICY.md.
• Rollout-derived optimization pack: parallel-execution-optimizer, benchmark-optimization-loop, data-throughput-accelerator, latency-critical-systems, recursive-decision-ledger.

Hardening since rc.1 (~30 PRs)

• Plugin hooks were silently no-ops on Node 21+ (#2184) — the hook runner depended on require.main under node -e; every plugin hook exited cleanly without running. If you are on Node 21+, update now.
• Windows reliability: CLAUDE_PLUGIN_ROOT normalization (#2139), stdin prompt passing (#2174), symlink/chmod test guards (#2171, [#2176]).
• Security: curl credentials out of argv (#2175), gateguard destructive-checkout gating (#2158) + env knobs (#2161), advisory intake hardening.
• Correctness: session-end $-sequence corruption (#2180), project-detect boundary matching (#2181), install manifest gaps (#2172), legacy shim truncation (#2167).
• Slimmer defaults: smaller OpenCode surface (#2140), rules/zh out of the default install (#2170).

The ECC Discord is live

https://discord.gg/36yGMHGFbR

• #announcements — releases auto-post and pin there (this very release was announced by the workflow shipped in it, [#2201])
• #pr-and-issues — live feed of every PR, issue, and release from this repo
• the ECC bot (built in this release, dependency-free gateway client) answers in-server:
• /skill name:<query> — look up any of the 261 skills
• /docs query:<terms> — search the docs
• /release — latest release
• /ecc, /help
• #feedback / #feature-requests — read directly by the maintainer; #control-pane — build-in-public on the ECC 2.0 operating surface
• 16 channels, 6 categories, community roles for Contributors, ECC Tools users, and AgentShield users

Install or upgrade

/plugin marketplace add https://github.com/affaan-m/ECC
/plugin install ecc

Existing installs: /plugin update ecc

Download

• Release tarball: ecc-universal-2.0.0.tgz (attached below)
• Full changelog: https://github.com/affaan-m/ECC/compare/v2.0.0-rc.1...v2.0.0

Verification

This release passed the full local validation gate before tagging: unicode safety, agent/command/rule/skill/hook validators, install-manifest checks, catalog and command-registry checks, and the complete test suite (SUITE EXIT: 0), plus markdownlint and the pre-push verification gate on every commit.

Credits

Authored by @affaan-m, built with Claude Code — including this release's Discord community, bot, and announce automation, which shipped themselves end to end.