c3

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This skill should be used when the user asks to "adopt C3", "onboard me to architecture", "scaffold C3 docs", "init C3", "audit architecture", "validate C3", or "check C3 docs". Also triggers when no .c3/ directory exists. Routes to c3-query for navigation, c3-alter for changes.

lagz0ne By lagz0ne schedule Updated 1/19/2026
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name: c3 description: | This skill should be used when the user asks to "adopt C3", "onboard me to architecture", "scaffold C3 docs", "init C3", "audit architecture", "validate C3", or "check C3 docs". Also triggers when no .c3/ directory exists. Routes to c3-query for navigation, c3-alter for changes.

C3 Architecture Assistant

REQUIRED: Load Harness First

Load ../../references/skill-harness.md for routing and red flags.

Mode Selection

Condition Mode
No .c3/README.md Adopt - Set up C3
Has .c3/ + "audit" intent Audit - Validate docs
Has .c3/ + other intent Route to c3-query or c3-alter

Mode: Adopt

Two rounds:

Round 1: Structure

User runs: PROJECT="MyApp" C1="backend" C2="frontend" ./scripts/c3-init.sh

Creates .c3/ with Context, Containers, ADR-000.

Round 2: Fill (Subagent)

Dispatch subagent with ../../references/container-patterns.md to:

Layer Task
Context (c3-0) Actors, containers, external systems, diagram, linkages
Container (c3-N) Assess complexity first, then components, diagram, fulfillment
Component (c3-NNN) Create from category template, add ## References
ADR-000 Document adoption, list containers, verification

Templates: ../../templates/component.md (unified), ../../templates/ref.md

Rules:

  • Complexity-first: Assess container complexity BEFORE documenting aspects
  • Discovery-over-checklist: Find what exists, don't assume from templates
  • Diagram first, tables second, linkages third
  • Every linkage needs REASONING
  • Sequential IDs: c3-101, c3-102, etc.
  • References: symbols first, patterns, then paths (3-7 items)
  • Categories: foundation or feature (no auxiliary)

Refs Discovery

After components are documented:

  1. Identify repeated patterns across components
  2. Extract to .c3/refs/ref-{pattern}.md
  3. Update components to cite refs instead of duplicating

Mode: Audit

REQUIRED: Load ../../references/audit-checks.md for full procedure.

Scope Command
Full system audit C3
Container audit container c3-1
ADR audit adr adr-YYYYMMDD-slug

Checks: Inventory vs code, categorization, reference validity, diagrams, ADR lifecycle

Install via CLI
npx skills add https://github.com/lagz0ne/prev-cli --skill c3
Repository Details
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article Path SKILL.md
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