Extract `/ultra-cc-architect-local` and `/ultra-skill-author-local` plus all 7 supporting agents, the `cc-architect-catalog` skill (13 files), the `ngram-overlap.mjs` IP-hygiene script, and the skill-factory test fixtures from `ultraplan-local` v2.4.0 into a new `ultra-cc-architect` plugin v0.1.0. Why: ultraplan-local had drifted into containing two distinct domains — a universal planning pipeline (brief → research → plan → execute) and a Claude-Code-specific architecture phase. Keeping them together forced users to inherit an unfinished CC-feature catalog (~11 seeds) when they only wanted the planning pipeline, and locked the catalog and the pipeline into the same release cadence. The architect was already optional and decoupled at the code level — only one filesystem touchpoint remained (auto-discovery of `architecture/overview.md`), which already handles absence gracefully. Plugin manifests: - ultraplan-local: 2.4.0 → 3.0.0 (description + keywords updated) - ultra-cc-architect: new at 0.1.0 (pre-release; catalog is thin, Fase 2/3 of skill-factory unbuilt, decision-layer empty, fallback list still needed) What stays in ultraplan-local: brief/research/plan/execute commands, all 19 planning agents, security hooks, plan auto-discovery of `architecture/overview.md` (filesystem-level contract, not code-level). What moved (28 files via git mv, R100 — full history preserved): - 2 commands, 8 agents, 1 skill catalog (13 files), 2 scripts, 8 fixtures Documentation updates: plugin CLAUDE.md and README.md for both plugins, root README.md (added ultra-cc-architect section, updated ultraplan-local section), root CLAUDE.md (added ultra-cc-architect to repo-struktur), marketplace.json (registered ultra-cc-architect), ultraplan-local CHANGELOG.md (v3.0.0 entry with migration guidance). Test verification: ngram-overlap.test.mjs passes 23/23 from new location. Memory updated: feedback_no_architect_until_v3.md now points at the new plugin and reframes the threshold around catalog maturity rather than an ultraplan-local milestone. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| name | description | layer | cc_feature | source | concept | last_verified | ngram_overlap_score | review_status |
|---|---|---|---|---|---|---|---|---|
| skills-reference | CC skills — auto-invoked domain modules with SKILL.md, frontmatter triggers, and file-hierarchy discovery. | reference | skills | https://docs.claude.com/en/docs/claude-code/skills | skills-system | 2026-04-18 | null | approved |
Skills — Reference
Claude Code's skill system is a way to package domain knowledge,
workflows, and supporting files so Claude can load them on demand. A
skill is a directory with a SKILL.md manifest and any auxiliary
files (scripts, templates, references).
Anatomy
SKILL.md— the entry point. Markdown file with YAML frontmatter and a body. The frontmatter declares when the skill triggers; the body is instructions Claude follows after loading.- Auxiliary files — any files in the skill directory. Loaded on
demand (typically by Claude reading them when the body references
them). Common:
scripts/,templates/,references/.
Frontmatter
---
name: <skill-name>
description: <one-line trigger hint>
---
The description is what Claude sees when deciding whether to invoke.
It should describe when to use the skill, not what it does.
Invocation
- Auto-invocation — Claude loads the skill when the user's prompt matches the description's triggers. The trigger model is implicit (natural-language match), not regex.
- Manual invocation — the user types
/<skill-name>and Claude calls the Skill tool. - Never auto-invoked — if the description explicitly says so ("Internal catalog for X — not invoked directly"), Claude typically respects the hint.
Discovery
Skills are discovered from:
- Built-in skills — shipped with the CLI.
- Plugin skills — packaged inside a plugin's
skills/directory. - User skills —
~/.claude/skills/. - Project skills —
.claude/skills/inside the repo.
The CLI surfaces available skills via --allowedTools and in the
system prompt.
Progressive disclosure
Skills use progressive disclosure:
- Claude sees only the name + description at session start.
- When a skill triggers, the body loads into context.
- Files referenced by the body load only when Claude reads them.
This keeps the baseline context small; depth is paid for on demand.
Relationship to other features
- Skills vs subagents — a skill lives in the parent's context when loaded. A subagent runs in its own context. Choose skill when the context flows through; subagent when it should not.
- Skills vs hooks — hooks are deterministic harness-level rules. Skills are context that Claude interprets. A skill cannot enforce; only guide.
- Skills vs MCP — MCP exposes tools. Skills are knowledge. An MCP tool + a skill that explains when to use it is a common pairing.