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ECC 2.0.0 — The Agent Harness Operating System

docs/releases/2.0.0/release-notes.md

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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+ (#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 (#2139), prompts passed via stdin so the shell does not mangle them (#2174), broken-symlink and chmod test guards (#2171, #2176).
  • Security: curl credentials kept out of argv (#2175), gateguard now gates force/path checkouts as destructive (#2158) with env knobs for routine-command gating (#2161), advisory intake hardening.
  • Correctness: session-end summaries no longer corrupt $-sequences in user messages (#2180), project detection matches package keys on boundaries so preact no longer reads as react (#2181), install manifest packaging gaps closed (#2172), corrupted legacy command shims truncated safely (#2167).
  • Slimmer defaults: smaller OpenCode install surface with gated hooks-runtime (#2140), rules/zh out of the always-loaded default install (#2170).
  • New surfaces: kubernetes-patterns skill (#2178), worktree-lifecycle service (#2164), MCP inventory (#2146), codex-worktree and opencode session adapters (#2145), the orch-* 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 (#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: https://github.com/affaan-m/ECC/compare/v2.0.0-rc.1...v2.0.0