---
name: update-related
description: Update CLAUDE.md for git-changed modules using batched agent execution (4 modules/agent) with gemini→qwen→codex fallback, <15 modules uses direct execution
argument-hint: "[--tool gemini|qwen|codex]"
---

# Related Documentation Update (/memory:update-related)

## Overview

Orchestrates context-aware CLAUDE.md updates for changed modules using batched agent execution with automatic tool fallback (gemini→qwen→codex).

**Parameters**:
- `--tool <gemini|qwen|codex>`: Primary tool (default: gemini)

**Execution Flow**:
1. Change Detection → 2. Plan Presentation → 3. Batched Agent Execution → 4. Safety Verification

## Core Rules

1. **Detect Changes First**: Use git diff to identify affected modules
2. **Wait for Approval**: Present plan, no execution without user confirmation
3. **Execution Strategy**:
   - <15 modules: Direct parallel execution (max 4 concurrent per depth, no agent overhead)
   - ≥15 modules: Agent batch processing (4 modules/agent, 73% overhead reduction)
4. **Tool Fallback**: Auto-retry with fallback tools on failure
5. **Depth Sequential**: Process depths N→0, parallel batches within depth (both modes)
6. **Related Mode**: Update only changed modules and their parent contexts

## Tool Fallback Hierarchy

```javascript
--tool gemini  →  [gemini, qwen, codex]  // default
--tool qwen    →  [qwen, gemini, codex]
--tool codex   →  [codex, gemini, qwen]
```

**Trigger**: Non-zero exit code from update script

## Phase 1: Change Detection & Analysis

```bash
# Detect changed modules (no index refresh needed)
bash(~/.claude/scripts/detect_changed_modules.sh list)

# Cache git changes
bash(git add -A 2>/dev/null || true)
```

**Parse output** `depth:N|path:<PATH>|change:<TYPE>` to extract affected modules.

**Smart filter**: Auto-detect and skip tests/build/config/docs based on project tech stack (Node.js/Python/Go/Rust/etc).

**Fallback**: If no changes detected, use recent modules (first 10 by depth).

## Phase 2: Plan Presentation

**Present filtered plan**:
```
Related Update Plan:
  Tool: gemini (fallback: qwen → codex)
  Changed: 4 modules | Batching: 4 modules/agent

  Will update:
  - ./src/api/auth (5 files) [new module]
  - ./src/api (12 files) [parent of changed auth/]
  - ./src (8 files) [parent context]
  - . (14 files) [root level]

  Auto-skipped (12 paths):
  - Tests: ./src/api/auth.test.ts (8 paths)
  - Config: tsconfig.json (3 paths)
  - Other: node_modules (1 path)

  Agent allocation:
  - Depth 3 (1 module): 1 agent [1]
  - Depth 2 (1 module): 1 agent [1]
  - Depth 1 (1 module): 1 agent [1]
  - Depth 0 (1 module): 1 agent [1]

  Confirm execution? (y/n)
```

**Decision logic**:
- User confirms "y": Proceed with execution
- User declines "n": Abort, no changes
- <15 modules: Direct execution
- ≥15 modules: Agent batch execution

## Phase 3A: Direct Execution (<15 modules)

**Strategy**: Parallel execution within depth (max 4 concurrent), no agent overhead, tool fallback per module.

```javascript
let modules_by_depth = group_by_depth(changed_modules);
let tool_order = construct_tool_order(primary_tool);

for (let depth of sorted_depths.reverse()) {  // N → 0
  let modules = modules_by_depth[depth];
  let batches = batch_modules(modules, 4);  // Split into groups of 4

  for (let batch of batches) {
    // Execute batch in parallel (max 4 concurrent)
    let parallel_tasks = batch.map(module => {
      return async () => {
        let success = false;
        for (let tool of tool_order) {
          let exit_code = bash(cd ${module.path} && ~/.claude/scripts/update_module_claude.sh "single-layer" "." "${tool}");
          if (exit_code === 0) {
            report("${module.path} updated with ${tool}");
            success = true;
            break;
          }
        }
        if (!success) {
          report("FAILED: ${module.path} failed all tools");
        }
      };
    });

    await Promise.all(parallel_tasks.map(task => task()));  // Run batch in parallel
  }
}
```

**Benefits**:
- No agent startup overhead
- Parallel execution within depth (max 4 concurrent)
- Tool fallback still applies per module
- Faster for small changesets (<15 modules)
- Same batching strategy as Phase 3B but without agent layer

---

## Phase 3B: Agent Batch Execution (≥15 modules)

### Batching Strategy

```javascript
// Batch modules into groups of 4
function batch_modules(modules, batch_size = 4) {
  let batches = [];
  for (let i = 0; i < modules.length; i += batch_size) {
    batches.push(modules.slice(i, i + batch_size));
  }
  return batches;
}
// Examples: 10→[4,4,2] | 8→[4,4] | 3→[3]
```

### Coordinator Orchestration

```javascript
let modules_by_depth = group_by_depth(changed_modules);
let tool_order = construct_tool_order(primary_tool);

for (let depth of sorted_depths.reverse()) {  // N → 0
  let batches = batch_modules(modules_by_depth[depth], 4);
  let worker_tasks = [];

  for (let batch of batches) {
    worker_tasks.push(
      Task(
        subagent_type="memory-bridge",
        description=`Update ${batch.length} modules at depth ${depth}`,
        prompt=generate_batch_worker_prompt(batch, tool_order, "related")
      )
    );
  }

  await parallel_execute(worker_tasks);  // Batches run in parallel
}
```

### Batch Worker Prompt Template

```
PURPOSE: Update CLAUDE.md for assigned modules with tool fallback (related mode)

TASK:
Update documentation for the following modules based on recent changes. For each module, try tools in order until success.

MODULES:
{{module_path_1}}
{{module_path_2}}
{{module_path_3}}
{{module_path_4}}

TOOLS (try in order):
1. {{tool_1}}
2. {{tool_2}}
3. {{tool_3}}

EXECUTION:
For each module above:
  1. cd "{{module_path}}"
  2. Try tool 1:
     bash(cd "{{module_path}}" && ~/.claude/scripts/update_module_claude.sh "single-layer" "." "{{tool_1}}")
     → Success: Report "{{module_path}} updated with {{tool_1}}", proceed to next module
     → Failure: Try tool 2
  3. Try tool 2:
     bash(cd "{{module_path}}" && ~/.claude/scripts/update_module_claude.sh "single-layer" "." "{{tool_2}}")
     → Success: Report "{{module_path}} updated with {{tool_2}}", proceed to next module
     → Failure: Try tool 3
  4. Try tool 3:
     bash(cd "{{module_path}}" && ~/.claude/scripts/update_module_claude.sh "single-layer" "." "{{tool_3}}")
     → Success: Report "{{module_path}} updated with {{tool_3}}", proceed to next module
     → Failure: Report "FAILED: {{module_path}} failed all tools", proceed to next module

REPORTING:
Report final summary with:
- Total processed: X modules
- Successful: Y modules
- Failed: Z modules
- Tool usage: {{tool_1}}:X, {{tool_2}}:Y, {{tool_3}}:Z
- Detailed results for each module
```

### Example Execution

**Depth 3 (new module)**:
```javascript
Task(subagent_type="memory-bridge", batch=[./src/api/auth], mode="related")
```

**Benefits**:
- 4 modules → 1 agent (75% reduction)
- Parallel batches, sequential within batch
- Each module gets full fallback chain
- Context-aware updates based on git changes

## Phase 4: Safety Verification

```bash
# Check only CLAUDE.md modified
bash(git diff --cached --name-only | grep -v "CLAUDE.md" || echo "Only CLAUDE.md files modified")

# Display statistics
bash(git diff --stat)
```

**Aggregate results**:
```
Update Summary:
  Total: 4 | Success: 4 | Failed: 0

  Tool usage:
  - gemini: 4 modules
  - qwen: 0 modules (fallback)
  - codex: 0 modules

  Changes:
  src/api/auth/CLAUDE.md  | 45 +++++++++++++++++++++
  src/api/CLAUDE.md       | 23 +++++++++--
  src/CLAUDE.md           | 12 ++++--
  CLAUDE.md               | 8 ++--
  4 files changed, 82 insertions(+), 6 deletions(-)
```

## Execution Summary

**Module Count Threshold**:
- **<15 modules**: Coordinator executes Phase 3A (Direct Execution)
- **≥15 modules**: Coordinator executes Phase 3B (Agent Batch Execution)

**Agent Hierarchy** (for ≥15 modules):
- **Coordinator**: Handles batch division, spawns worker agents per depth
- **Worker Agents**: Each processes 4 modules with tool fallback (related mode)

## Error Handling

**Batch Worker**:
- Tool fallback per module (auto-retry)
- Batch isolation (failures don't propagate)
- Clear per-module status reporting

**Coordinator**:
- No changes: Use fallback (recent 10 modules)
- User decline: No execution
- Safety check fail: Auto-revert staging
- Partial failures: Continue execution, report failed modules

**Fallback Triggers**:
- Non-zero exit code
- Script timeout
- Unexpected output

## Tool Reference

| Tool   | Best For                       | Fallback To    |
|--------|--------------------------------|----------------|
| gemini | Documentation, patterns        | qwen → codex   |
| qwen   | Architecture, system design    | gemini → codex |
| codex  | Implementation, code quality   | gemini → qwen  |

## Usage Examples

```bash
# Daily development update
/memory:update-related

# After feature work with specific tool
/memory:update-related --tool qwen

# Code quality review after implementation
/memory:update-related --tool codex
```

## Key Advantages

**Efficiency**: 30 modules → 8 agents (73% reduction)
**Resilience**: 3-tier fallback per module
**Performance**: Parallel batches, no concurrency limits
**Context-aware**: Updates based on actual git changes
**Fast**: Only affected modules, not entire project

## Coordinator Checklist

- Parse `--tool` (default: gemini)
- Refresh code index for accurate change detection
- Detect changed modules via detect_changed_modules.sh
- **Smart filter modules** (auto-detect tech stack, skip tests/build/config/docs)
- Cache git changes
- Apply fallback if no changes (recent 10 modules)
- Construct tool fallback order
- **Present filtered plan** with skip reasons and change types
- **Wait for y/n confirmation**
- Determine execution mode:
  - **<15 modules**: Direct execution (Phase 3A)
    - For each depth (N→0): Sequential module updates with tool fallback
  - **≥15 modules**: Agent batch execution (Phase 3B)
    - For each depth (N→0): Batch modules (4 per batch), spawn batch workers in parallel
- Wait for depth/batch completion
- Aggregate results
- Safety check (only CLAUDE.md modified)
- Display git diff statistics + summary

## Comparison with Full Update

| Aspect | Related Update | Full Update |
|--------|----------------|-------------|
| **Scope** | Changed modules only | All project modules |
| **Speed** | Fast (minutes) | Slower (10-30 min) |
| **Use case** | Daily development | Major refactoring |
| **Mode** | `"related"` | `"full"` |
| **Trigger** | After commits | After major changes |
| **Batching** | 4 modules/agent | 4 modules/agent |
| **Fallback** | gemini→qwen→codex | gemini→qwen→codex |
| **Complexity threshold** | ≤15 modules | ≤20 modules |