ECC 2.0.0 — The Agent Harness Operating System release

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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.

Highlights

• 261 public skills across coding, research, security, media, enterprise ops, and agent workflows.
• ECC 2.0 control-pane substrate: harness-neutral session adapters (ecc.session.v1) covering Claude Code, Codex, OpenCode, and dmux.
• MCP inventory (ecc.mcp.v1): one normalized view of MCP server configs across harnesses, with fragmentation and drift detection and secret redaction.
• Worktree-lifecycle service: deterministic conflict prediction and safe garbage collection for parallel agent worktrees.
• orch-* orchestrator skill family plus dynamic workflow team orchestration.
• Rollout-derived optimization pack: parallel-execution-optimizer, benchmark-optimization-loop, data-throughput-accelerator, latency-critical-systems, recursive-decision-ledger.

Hardening since rc.1

Roughly thirty PRs of fixes landed between rc.1 and stable. The ones worth knowing about:

• Plugin hooks were silently no-ops on Node 21+ (fix: plugin hooks no-op on Node 21+ (require.main undefined under -e) + green the suite #2184). The hook runner depended on require.main under node -e, which newer Node leaves undefined — every plugin hook exited cleanly without running. If you are on Node 21 or newer, update now.
• Windows reliability: CLAUDE_PLUGIN_ROOT path normalization (fix: normalize POSIX CLAUDE_PLUGIN_ROOT to Windows path in hook bootstrap #2139), prompts passed via stdin so the shell does not mangle them (fix: send claude prompt via stdin so Windows shell mode doesn't mangle it #2174), broken-symlink and chmod test guards (test: skip chmod-based permission tests when running as root #2171, test: guard broken-symlink tests so the suite passes on Windows #2176).
• Security: curl credentials kept out of argv (fix(skills): keep curl credentials out of argv #2175), gateguard now gates force/path checkouts as destructive (fix(gateguard): gate force/path git checkout as destructive #2158) with env knobs for routine-command gating (feat(gateguard): add env knobs for routine bash gate + extra destructive patterns #2161), advisory intake hardening.
• Correctness: session-end summaries no longer corrupt $-sequences in user messages (fix(session-end): preserve $-sequences in user messages (summary corruption) #2180), project detection matches package keys on boundaries so preact no longer reads as react (fix(project-detect): match packageKeys on boundaries, not substrings (preact→react) #2181), install manifest packaging gaps closed (fix: close install manifest packaging gaps #2172), corrupted legacy command shims truncated safely (fix: truncate corrupted legacy command shims #2167).
• Slimmer defaults: smaller OpenCode install surface with gated hooks-runtime (fix: shrink default OpenCode install surface and gate hooks-runtime #2140), rules/zh out of the always-loaded default install (fix: retire rules/zh from the always-loaded default rules install #2170).
• New surfaces: kubernetes-patterns skill (feat(skills): add kubernetes-patterns skill #2178), worktree-lifecycle service (feat: worktree-lifecycle service (deterministic conflict prediction + safe GC) #2164), MCP inventory (feat: MCP inventory (ecc.mcp.v1) — unified cross-harness MCP config view #2146), codex-worktree and opencode session adapters (feat: extend session-adapter layer with codex-worktree + opencode adapters #2145), the orch-* family (feat: add orch-* orchestrator skill family #2153).

Community launch

The ECC Discord is live: https://discord.gg/36yGMHGFbR

• Release news lands in #announcements, auto-posted and pinned by the release workflow shipped in this very release (feat(discord): release -> #announcements auto-post + pin + GitHub Discussions #2201).
• A live PR and issue feed runs in #pr-and-issues.
• The ECC bot answers /skill, /docs, and /release lookups in-server.
• #feedback and #feature-requests are read directly by the maintainer and shape the roadmap.

Install or upgrade

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

Existing installs: /plugin update ecc

Full changelog: v2.0.0-rc.1...v2.0.0
Release: https://github.com/affaan-m/ECC/releases/tag/v2.0.0