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* feat: add Plan Canvas - browser annotate-and-approve review for plan artifacts - scripts/plan-canvas.js CLI (open/await/end/stop/server; bin ecc-plan-canvas) - loopback server + ECC-styled chrome + annotation SDK + zero-dep markdown renderer - Approve/Request-changes verdicts wired to the /plan confirmation gate - plan-canvas skill, /plan-canvas command, SessionStart hook surfacing open reviews - shared scripts/lib/loopback-guard.js extracted from control-pane (API re-exported) - 121 new tests incl. full-workflow E2E; registered in manifests, catalog, registry Inspired by lavish-axi (https://github.com/kunchenguid/lavish-axi) by @kunchenguid; original ECC-native implementation, not a port. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * refactor(plan-canvas): invoke via ecc-plan-canvas bin so the skill works from any project Skill/command referenced a cwd-relative `node scripts/plan-canvas.js`, unusable outside the ECC root. Switch to the ecc-plan-canvas bin (and $CLAUDE_PLUGIN_ROOT fallback) and align CLI next_step hints so an agent can run it as a skill in any repo. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * feat(plan-canvas): render Mermaid diagrams + ship Codex cross-harness surface - markdown renderer emits <pre class="mermaid"> for ```mermaid blocks (source entity-escaped so the browser decodes it for the renderer while blocking injection) - artifact template loads a pinned Mermaid build only when a diagram is present, themed to ECC dark, securityLevel strict, graceful offline fallback to source (ECC_PLAN_CANVAS_MERMAID_URL overrides for a local mirror) - skill teaches Mermaid-for-diagrams and states the CLI+JSON loop is harness-agnostic - add .agents/skills/plan-canvas (Codex) with agents/openai.yaml interface manifest - register in install-modules workflow-quality paths; docs updated Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * docs(plan-canvas): add demo screenshot Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * fix(ci): sync yarn.lock with new bin; add contributor checklist - yarn.lock records the ecc-plan-canvas bin so Yarn hardened-mode install no longer wants to modify the lockfile on public PRs - PR template + CONTRIBUTING gain a pre-push checklist covering the lockfile trap and the full skill/command/CLI registration surfaces Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Haley Chen <2022hachen@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Plugin Manifest Gotchas
If you plan to edit .claude-plugin/plugin.json, be aware that the Claude plugin validator enforces several undocumented but strict constraints that can cause installs to fail with vague errors (for example, agents: Invalid input). In particular, component fields must be arrays, agents is not a supported manifest field and must not be included in plugin.json, and a version field is required for reliable validation and installation.
These constraints are not obvious from public examples and have caused repeated installation failures in the past. They are documented in detail in .claude-plugin/PLUGIN_SCHEMA_NOTES.md, which should be reviewed before making any changes to the plugin manifest.
Custom Endpoints and Gateways
ECC does not override Claude Code transport settings. If Claude Code is configured to run through an official LLM gateway or a compatible custom endpoint, the plugin continues to work because hooks, skills, and any retained legacy command shims execute locally after the CLI starts successfully.
Use Claude Code's own environment/configuration for transport selection, for example:
export ANTHROPIC_BASE_URL=https://your-gateway.example.com
export ANTHROPIC_AUTH_TOKEN=your-token
claude