0aab176e7d
BREAKING CHANGES: - Renamed n8n_update_workflow to n8n_update_full_workflow for clarity NEW FEATURES: - Added n8n_update_partial_workflow tool for diff-based workflow editing - Implemented WorkflowDiffEngine with 13 operation types - Added transactional updates with two-pass processing - Maximum 5 operations per request for reliability - Operations can be in any order - engine handles dependencies - Added validateOnly mode for testing changes before applying - 80-90% token savings by only sending changes IMPROVEMENTS: - Enhanced tool description with comprehensive parameter documentation - Added clear examples for simple and complex use cases - Improved error messages and validation - Added extensive test coverage for all operations DOCUMENTATION: - Added workflow-diff-examples.md with usage patterns - Added transactional-updates-example.md showing before/after - Updated README.md with v2.7.0 features - Updated CLAUDE.md with latest changes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
118 lines
3.2 KiB
Markdown
118 lines
3.2 KiB
Markdown
# Transactional Updates Example
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This example demonstrates the new transactional update capabilities in v2.7.0.
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## Before (v2.6.x and earlier)
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Previously, you had to carefully order operations to ensure nodes existed before connecting them:
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```json
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{
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"id": "workflow-123",
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"operations": [
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// 1. First add all nodes
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{ "type": "addNode", "node": { "name": "Process", "type": "n8n-nodes-base.set", ... }},
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{ "type": "addNode", "node": { "name": "Notify", "type": "n8n-nodes-base.slack", ... }},
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// 2. Then add connections (would fail if done before nodes)
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{ "type": "addConnection", "source": "Webhook", "target": "Process" },
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{ "type": "addConnection", "source": "Process", "target": "Notify" }
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]
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}
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```
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## After (v2.7.0+)
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Now you can write operations in any order - the engine automatically handles dependencies:
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```json
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{
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"id": "workflow-123",
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"operations": [
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// Connections can come first!
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{ "type": "addConnection", "source": "Webhook", "target": "Process" },
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{ "type": "addConnection", "source": "Process", "target": "Notify" },
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// Nodes added later - still works!
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{ "type": "addNode", "node": { "name": "Process", "type": "n8n-nodes-base.set", "position": [400, 300] }},
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{ "type": "addNode", "node": { "name": "Notify", "type": "n8n-nodes-base.slack", "position": [600, 300] }}
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]
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}
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```
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## How It Works
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1. **Two-Pass Processing**:
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- Pass 1: All node operations (add, remove, update, move, enable, disable)
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- Pass 2: All other operations (connections, settings, metadata)
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2. **Operation Limit**: Maximum 5 operations per request keeps complexity manageable
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3. **Atomic Updates**: All operations succeed or all fail - no partial updates
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## Benefits for AI Agents
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- **Intuitive**: Write operations in the order that makes sense logically
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- **Reliable**: No need to track dependencies manually
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- **Simple**: Focus on what to change, not how to order changes
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- **Safe**: Built-in limits prevent overly complex operations
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## Complete Example
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Here's a real-world example of adding error handling to a workflow:
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```json
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{
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"id": "workflow-123",
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"operations": [
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// Define the flow first (makes logical sense)
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{
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"type": "removeConnection",
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"source": "HTTP Request",
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"target": "Save to DB"
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},
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{
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"type": "addConnection",
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"source": "HTTP Request",
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"target": "Error Handler"
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},
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{
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"type": "addConnection",
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"source": "Error Handler",
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"target": "Send Alert"
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},
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// Then add the nodes
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{
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"type": "addNode",
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"node": {
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"name": "Error Handler",
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"type": "n8n-nodes-base.if",
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"position": [500, 400],
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"parameters": {
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"conditions": {
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"boolean": [{
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"value1": "={{$json.error}}",
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"value2": true
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}]
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}
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}
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}
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},
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{
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"type": "addNode",
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"node": {
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"name": "Send Alert",
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"type": "n8n-nodes-base.emailSend",
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"position": [700, 400],
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"parameters": {
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"to": "alerts@company.com",
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"subject": "Workflow Error Alert"
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}
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}
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}
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]
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}
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```
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All operations will be processed correctly, even though connections reference nodes that don't exist yet! |