@ar-llm/pi-plan-mode

Pi extension that adds a read-only plan mode for safe code exploration. Restricts tools, tracks numbered plan steps with /plan and /todos, and shows progress in a widget.

Install

pi install 'npm:@ar-llm/pi-plan-mode'

Or try without installing:

pi -e 'npm:@ar-llm/pi-plan-mode'

Usage

Toggle Plan Mode

• Command: /plan - Toggle plan mode on/off
• Shortcut: Ctrl+Alt+P - Toggle plan mode on/off
• Flag: --flag=plan - Start in plan mode

Commands

• /plan - Toggle plan mode (read-only exploration)
• /todos - Show current plan todo list

How It Works

Plan mode provides a safe, read-only environment for code exploration and planning:

1. Tool Restrictions: Only read-only tools are available (read, bash, grep, find, ls, questionnaire)
2. Command Allowlist: Bash commands are restricted to a configurable allowlist of safe, read-only commands
3. Plan Extraction: Automatically detects numbered plans under "Plan:" headers
4. Progress Tracking: Track completion with [DONE:n] markers (e.g., [DONE:1] marks step 1 complete)
5. UI Widgets: Shows progress widget and status bar during execution

Workflow

1. Enable plan mode with /plan or Ctrl+Alt+P
2. Ask the agent to explore and create a plan
3. Agent generates a numbered plan under a "Plan:" header
4. Choose to:
   • Execute the plan - Full tool access restored, progress tracked
   • Stay in plan mode - Continue refining the plan
   • Refine the plan - Edit the plan before execution
5. During execution, mark steps complete with [DONE:n] tags
6. Widget shows progress (e.g., "📋 2/5")

Configuration

Create a config file at ~/.config/pi/agent/ar-llm/plan-mode.json to customize behavior.

Example Configuration

{
  "commands": {
    "safePatterns": [
      "/^\\s*cat\\b/",
      "/^\\s*grep\\b/",
      "/^\\s*find\\b/",
      "/^\\s*ls\\b/",
      "/^\\s*git\\s+(status|log|diff)/i"
    ],
    "destructivePatterns": [
      "/\\brm\\b/i",
      "/\\bgit\\s+(add|commit|push)/i"
    ]
  },
  "tools": {
    "planModeTools": ["read", "bash", "grep", "find", "ls"],
    "normalModeTools": ["read", "bash", "edit", "write"]
  },
  "extraction": {
    "planHeaderPattern": "/\\*{0,2}Plan:\\*{0,2}\\s*\\n/i",
    "stepNumberPattern": "/^\\s*(\\d+)[.)]\\s+\\*{0,2}([^*\\n]+)/gm",
    "doneMarkerPattern": "/\\[DONE:(\\d+)\\]/gi",
    "maxStepLength": 50,
    "cleanStepText": true
  },
  "prompts": {
    "planModeContext": "[PLAN MODE ACTIVE]\nYou are in plan mode - read-only...\nTools: {tools}",
    "executionContext": "[EXECUTING PLAN]\nRemaining steps:\n{todoList}\nUse [DONE:n] to mark complete"
  }
}

Config Fields

commands (optional)

Command allowlist configuration.

Field	Type	Description
safePatterns	string[]	Regex patterns (as strings) for commands allowed in plan mode. Commands must match at least one pattern.
destructivePatterns	string[]	Regex patterns (as strings) for commands blocked in plan mode. Commands matching any pattern are blocked.

Pattern Format: Patterns must be strings with regex delimiters, e.g., "/^\\s*cat\\b/" (not /^\s*cat\b/).

tools (optional)

Tool restriction configuration.

Field	Type	Description
planModeTools	string[]	Tools available in plan mode (read-only). Default: ["read", "bash", "grep", "find", "ls", "questionnaire"]
normalModeTools	string[]	Tools available in normal mode (full access). Default: ["read", "bash", "edit", "write"]

extraction (optional)

Plan extraction and parsing configuration.

Field	Type	Description
planHeaderPattern	string	Regex pattern to detect "Plan:" header. Default: "/\\*{0,2}Plan:\\*{0,2}\\s*\\n/i"
stepNumberPattern	string	Regex pattern for numbered steps. Default: /^\s*(\d+)[.)]\s+\*{0,2}([^\*\n]+)/gm
doneMarkerPattern	string	Regex pattern for [DONE:n] markers. Default: "/\\[DONE:(\\d+)\\]/gi"
maxStepLength	number	Maximum step text length before truncation. Default: 50
cleanStepText	boolean	Remove markdown formatting from step text. Default: true

prompts (optional)

System prompt configuration.

Field	Type	Description
planModeContext	string	System prompt for plan mode. Use {tools} to insert allowed tools list.
executionContext	string	System prompt for execution mode. Use {todoList} to insert remaining steps.

providers (optional)

Provider-specific overrides. Each key is a session provider name (e.g., "openrouter", "github-copilot").

Field	Type	Description
enabled	boolean	Set to false to disable plan mode for this provider. Default: true
commands	object	Override command allowlists for this provider.
tools	object	Override tool restrictions for this provider.

Resolution Order

Configuration is resolved in this order (later overrides earlier):

1. Built-in defaults - Safe, conservative defaults
2. Config file settings - Your preferences in plan-mode.json

License

MIT — derived from earendil-works/pi, copyright Mario Zechner.