deep-think

Deep Think

A Claude Code plugin for structured reasoning. Think through complex problems with strategies, branching, reflection, and persistent checkpoints.

Install

# Add the bis-code marketplace (one-time — gives access to all bis-code plugins)
/plugin marketplace add bis-code/claude-plugins

# Install the plugin
/plugin install deep-think@bis-code

How It Works

Deep Think provides 5 MCP tools that work together:

strategize → think → reflect → branch → checkpoint
     |          |        |         |          |
  Pick a    Record    Check     Explore    Save/restore
  reasoning  steps    for       alternate  reasoning
  framework          issues    paths      state

Start a session with /start and describe what you're reasoning about. The plugin suggests a strategy and begins the thought chain.

Auto-checkpointing saves your reasoning before context compaction and every 10 thoughts (configurable). Resume anytime with /checkpoints.

Commands

Command	What it does
/start	Launch a reasoning session from a description
/checkpoints	View, restore, or delete saved checkpoints
/constraints	Manage reasoning rules and anti-patterns
/practices	Manage review checklists and custom strategies

Skills (auto-triggering)

Skill	Triggers when...
restore-checkpoint	Starting a new session and continuing previous reasoning
manage-constraints	User says "remember to always check X" or "add a rule about Y"
manage-practices	User says "add a review step for..." or "create a strategy for..."

Configuration

Create .deep-think.json in your project root to customize:

{
  "thinking": {
    "defaultStrategy": "first-principles",
    "maxThoughts": 50,
    "autoCheckpointEvery": 10
  },
  "practices": {
    "rules": ["Always consider security implications"],
    "antiPatterns": ["Premature optimization"],
    "reviewChecklist": ["Check for edge cases"]
  },
  "strategies": {
    "custom": [{
      "name": "incident-response",
      "description": "Structured incident investigation",
      "steps": ["Identify symptoms", "Gather evidence", "Form hypothesis", "Verify"],
      "checkpoints": ["Evidence collected?", "Root cause confirmed?"]
    }]
  }
}

Or use commands to manage configuration conversationally:

• /constraints — add rules like "always verify auth boundaries"
• /practices — add review steps or custom strategies

Built-in Strategies

Strategy	Use when...
first-principles	Conventional wisdom may be misleading
red-team	Validating important decisions
convergent	Choosing between multiple options
divergent	Brainstorming or stuck on a problem
root-cause	Debugging or investigating failures
decision-matrix	High-stakes decisions with multiple factors

License

MIT