brainstorming

Brainstorming Skill

Overview

Collaborative design exploration for new features, architecture decisions, and complex problem-solving.

Triggers

Activate this skill when:

• User says "let's brainstorm", "let's ideate", or "let's explore"
• User runs /exarchos:ideate command
• User wants to discuss design options before implementation
• A problem has multiple valid solutions needing evaluation

For a complete worked example, see references/worked-example.md.

Three-Phase Process

Phase 1: Understanding

Goal: Deeply understand the problem before proposing solutions.

Rules:

• Ask ONE question at a time
• Wait for response before asking next question
• Focus on: goals, constraints, existing patterns, user preferences
• Maximum 5 questions before moving to exploration

Question Types:

1. "What problem are we solving?" (core need)
2. "What constraints exist?" (time, tech, compatibility)
3. "What patterns already exist in the codebase?" (consistency)
4. "Who/what will consume this?" (users, APIs, other systems)
5. "What does success look like?" (acceptance criteria)

Phase 2: Exploration

Goal: Present 2-3 distinct approaches with trade-offs.

Use the approach format from references/design-template.md. Present genuinely different approaches with honest trade-offs. Recommend one option with rationale.

Phase 3: Design Presentation

Goal: Document the chosen approach in detail with numbered requirements.

Document the chosen approach using the structure in references/design-template.md. Sections of 200-300 words max. Use diagrams for complex flows.

Requirements format (MANDATORY):

• Use numbered requirement identifiers: DR-1, DR-2, ..., DR-N
• Each requirement MUST have an **Acceptance criteria:** block with concrete, testable criteria
• At least one requirement MUST address error handling, failure modes, or edge cases
• These DR-N identifiers are provenance anchors — implementation plans trace tasks to them

Save Location: docs/designs/YYYY-MM-DD-<feature>.md

Iteration Limits

Design iterations: max 3. If Phase 2 (Exploration) cycles through 3 rounds of presenting approaches without the user converging on a choice, pause and summarize the trade-offs for the user to make a final decision.

The user can override: /exarchos:ideate --max-iterations 5

Anti-Patterns

Don't	Do Instead
Jump to solution immediately	Ask clarifying questions first
Present only one option	Always show 2-3 alternatives
Hide drawbacks of preferred option	Be transparent about trade-offs
Write walls of text	Use 200-300 word sections max
Ignore existing patterns	Reference codebase conventions
Skip documentation	Save design to docs/designs/

State Management

This skill manages workflow state for context persistence.

On Start (before Phase 1)

Initialize workflow state using mcp__plugin_exarchos_exarchos__exarchos_workflow with action: "init", workflowType: "feature", and the featureId.

This creates a state file tracked by the MCP server.

On Design Save (after Phase 3)

action: "set", featureId: "<id>", updates: { "artifacts": { "design": "<path>" } }, phase: "plan"

Phase Transitions and Guards

This skill is the entry point for the feature workflow (workflowType: "feature"). The full lifecycle is:

ideate → plan → plan-review → delegate ⇄ review → synthesize → completed

For the full transition table, consult @skills/workflow-state/references/phase-transitions.md.

Schema Discovery

Use exarchos_workflow({ action: "describe", actions: ["set", "init"] }) for parameter schemas and exarchos_workflow({ action: "describe", playbook: "feature" }) for phase transitions, guards, and playbook guidance.

Completion Verification

Run the ideation artifact verification:

mcp__plugin_exarchos_exarchos__exarchos_orchestrate({
  action: "check_design_completeness",
  featureId: "<featureId>",
  designPath: "docs/designs/YYYY-MM-DD-<feature>.md"
})

On passed: true: All completion criteria met — proceed to gate check. On passed: false: Missing artifacts — review output and complete before continuing. If the check is advisory (advisory: true), emit a warning but do not block auto-chain.

Adversarial Gate Check (ideate → plan)

After artifact verification passes, run the design completeness gate check. This is the D1 (spec fidelity) lightweight adversarial check at the ideate → plan boundary.

mcp__plugin_exarchos_exarchos__exarchos_orchestrate({
  action: "check_design_completeness",
  featureId: "<id>",
  designPath: "<path>"
})

The handler returns a structured result: { passed, advisory, findings[], checkCount, passCount, failCount }.

• passed=true: Design complete — all requirements have acceptance criteria and error coverage.
• passed=false, advisory=true: Findings detected. These are advisory — they do NOT block the auto-chain to /exarchos:plan. Present result.data.findings to the user alongside the transition message.

Gate events (gate.executed) are emitted automatically by the handler — no manual event emission is needed.

Transition

After brainstorming completes, auto-continue to planning (no user confirmation):

Pre-Chain Validation (MANDATORY)

Before invoking /exarchos:plan:

1. Verify artifacts.design exists in workflow state
2. Verify the design file exists on disk: test -f "$DESIGN_PATH"
3. Run mcp__plugin_exarchos_exarchos__exarchos_orchestrate({ action: "check_design_completeness", featureId: "<id>", designPath: "<path>" }) (advisory — record findings but don't block)
4. If steps 1 or 2 fail: "Design artifact not found, cannot auto-chain to /exarchos:plan"

Chain Steps

1. Update state: action: "set", featureId: "<id>", updates: { "artifacts": { "design": "<path>" } }, phase: "plan"

2. If result.data.passed === false and result.data.advisory === true: Output result.data.findings summary, then: "Advisory findings noted. Auto-continuing to implementation planning..." If result.data.passed === true: Output: "Design complete. Auto-continuing to implementation planning..."

3. Invoke immediately:

   Skill({ skill: "exarchos:plan", args: "<design-path>" })
   

This is NOT a human checkpoint. The human checkpoint occurs at plan-review (plan approval) and synthesize (merge confirmation).

Workflow continues: /exarchos:ideate -> /exarchos:plan -> plan-review -> [HUMAN CHECKPOINT] -> /exarchos:delegate -> /exarchos:review -> /exarchos:synthesize -> [HUMAN CHECKPOINT]

Exarchos Integration

When Exarchos MCP tools are available:

1. At workflow start: Auto-emitted by exarchos_workflow action: "init" — do NOT manually append workflow.started