C3 Config

C3 Config

Overview

Create and refine .c3/​settings.yaml for project-specific preferences through Socratic questioning.

Announce at start: "I'm using the c3-config skill to configure project settings."

Quick Reference

Settings Structure

diagrams: |
  mermaid
  sequence: API interactions, request flows
  flowchart: decision logic, error handling

context:
  useDefaults: true
  guidance: |
    your context guidance
  include: |
    additional items to include
  exclude: |
    items to exclude
  litmus: |
    custom litmus test (optional)
  diagrams: |
    custom diagram guidance (optional)

container:
  useDefaults: true
  guidance: |
    your container guidance
  # Same keys as context

component:
  useDefaults: true
  guidance: |
    your component guidance
  # Same keys as context

guard: |
  discovered incrementally

adr:
  requirePlan: true
  coherenceCheck: true
  planGranularity: detailed  # detailed | summary

handoff: |
  after ADR accepted:
  1. create implementation tasks
  2. notify team
  target: vibe_kanban  # or: linear, jira, github, manual

audit: |
  handoff: tasks  # tasks | manual | agents

For merge logic details, see references/​settings-merge.md.

Socratic Refinement

Refine sections through targeted questions:

Diagrams:

• "What diagramming tool does your team use?"
• "What types of diagrams are most useful?"

Layer Configuration (Context/​Container/​Component):

• "Use default include/​exclude rules, or customize?"
• "Items that should ALWAYS be at this layer?"
• "Items that should NEVER be at this layer?"

Guardrails:

• "Architectural decisions that should never be revisited?"
• "Technologies or patterns that are off-limits?"

ADR Settings:

• "Should Implementation Plan be required?" (default: yes)
• "Verify ADR-Plan coherence before handoff?" (default: yes)
• "Code Changes granularity?" (detailed: file:function, summary: file-only)

Handoff:

• "What happens after an ADR is accepted?"
• "How should tasks be tracked?" (GitHub, Jira, Linear, vibe_kanban, etc.)

Audit:

• "How should audit findings be handled?" (manual, tasks, agents)

Process

1. Check Existing Settings

ls .c3/​settings.yaml 2>/​dev/​null && echo "EXISTS" || echo "MISSING"

• EXISTS: Load and show current settings
• MISSING: Create with defaults

2. Initialize or Load

If missing, create with sensible defaults. If exists, load and ask: "Which section would you like to refine?"

3. Socratic Refinement

Focus on gaps, one section at a time. User can skip any section.

4. Write Settings

Save to .c3/​settings.yaml and verify sections exist.

Invocation Contexts

Key Principles

• Sensible defaults - Works out-of-box, customization optional
• Incremental discovery - Guardrails grow over time
• Flexible format - YAML with prose values
• User-editable - Human-readable/​editable
• Non-blocking - Missing settings doesn't break other skills

Checklist

• Checked for existing .c3/​settings.yaml
• Initialized or loaded current settings
• Each section reviewed via Socratic questions
• Handoff steps configured
• Settings file saved and verified

Related

• references/​settings-merge.md - Merge logic details
• c3-adopt - Calls c3-config during initialization
• c3-design - Reads settings at start