name: openspec-replan
description: "Adaptive refinement for blocked or drifted changes. Use when: implementation is blocked, scope drifts >20%, or direction needs to change."
model: sonnet
allowed-tools: [Glob, Grep, Read, Edit, Write, Bash, AskUserQuestion]

OpenSpec Replan

Adaptive refinement skill for blocked or drifted changes. Proposes revised tasks or pivots.

Workflow: Analyze → Propose → Confirm → Apply

flowchart LR
    A["Analyze blocker/drift"] --> B["Read context"]
    B --> C["Propose revisions"]
    C --> D{"User approval?"}
    D -->|Yes| E["Apply changes"]
    D -->|No| F["Discard"]
    E --> G["Document blocker"]

    classDef action fill:#C8E6C9,stroke:#388E3C,color:#000
    classDef gate fill:#E1BEE7,stroke:#7B1FA2,color:#000
    classDef discard fill:#FFCDD2,stroke:#D32F2F,color:#000

    class A,B,C,E,G action
    class D gate
    class F discard

Critical: Always wait for user confirmation before applying changes (ask_first trust zone).

Exploration Strategy

Before replanning, consult openspec/project.md → Exploration Strategy section:

1. Context sources: Read primary files (project.md, proposal.md, specs)
2. Must-read files: CLAUDE.md, settings.json (project constraints)
3. Tools: Use configured codebase tools (Glob, Grep, Read, or MCP if enabled)
4. Existing tasks: Read tasks.md to understand current plan
5. Philosophy: Read Execution Philosophy section for current mode and principles

Commands

replan

Revise tasks when implementation is blocked.

Input: $ARGUMENTS = change-id [blocker-description]

Workflow:
1. Read openspec/changes/{change-id}/tasks.md, proposal.md, specs
2. Identify blocker (from argument or ask user)
3. Analyze which tasks are affected
4. Minimal change preference: Revise only affected tasks, not entire list
5. Propose revised tasks with blocker context
6. Wait for user approval before applying
7. If approved: Update tasks.md with revisions
8. Document blocker as comment in tasks.md

Proposal format:

## Replan Proposal for {change-id}

### Blocker
{blocker description}

### Affected Tasks
- {task-number}: {original} -> {revised}
- {task-number}: REMOVED (blocked)
- NEW {task-number}: {new task}

### Impact
{n} tasks modified, {m} removed, {p} added

Approve these changes? [y/N]

After approval:

Replan applied for {change-id}
Modified: {n} tasks
Removed: {m} tasks
Added: {p} tasks
Blocker documented in tasks.md

pivot

Handle major scope shifts when direction changes.

Input: $ARGUMENTS = change-id [reason]

Workflow:
1. Read current proposal.md and tasks.md
2. Ask user for new direction if not provided
3. Draft new proposal.md reflecting changed scope
4. Generate new tasks.md for revised approach
5. Wait for user approval before applying
6. If approved: Archive old files, write new ones

Proposal format:

## Pivot Proposal for {change-id}

### Current Direction
{summary of existing proposal}

### New Direction
{proposed new approach}

### Reason
{why pivot is needed}

### New Tasks
{numbered task list}

Approve this pivot? [y/N]

After approval:

Pivot applied for {change-id}
Old proposal archived: proposal.md.bak
New proposal: {brief summary}
New tasks: {count} items

Guardrails

Trust Zone: ask_first (all changes require human approval)

Always ask before:
- Modifying tasks.md
- Modifying proposal.md
- Archiving files
- Any scope changes

Scope deviation threshold: >20%
- If openspec-reflect reports >20% drift, suggest replan
- Show deviation calculation in proposal

Minimal change preference:
- Count affected vs unaffected tasks
- If <50% affected, revise only those tasks
- If >50% affected, consider pivot instead

Philosophy Check

Before proposing revisions, read openspec/project.md → Execution Philosophy → mode.

Apply mode principles to revised plan:

Philosophy check ({mode} mode):
- Principles: {list applicable}
- Trade-offs accepted: {from mode config}
- Anti-patterns avoided: {list}

Examples by mode:
- garage: Accept minimal revisions, avoid over-planning, defer optimization
- scale: Document decision rationale, ensure test coverage for new tasks
- maintenance: Minimize blast radius, prefer conservative changes

Blocker Documentation

When replan completes, add comment to tasks.md:

<!-- REPLAN: {date}
Blocker: {description}
Resolution: {how revised tasks address it}
Tasks affected: {list}
-->

Insert after section header of first affected task.

Scope Deviation Calculation

Calculate deviation when triggered by reflect:

Deviation = (|planned - actual| / planned) * 100%

Where:
- planned = tasks in original tasks.md
- actual = completed + new tasks needed

Example:
- Original: 10 tasks
- Completed: 4 tasks
- New tasks needed: 5 tasks
- Deviation = (|10 - 9| / 10) * 100% = 10% (under threshold)

Trigger replan suggestion at >20% deviation.