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Architecture diagram
sequenceDiagram
participant UI as Editor UI / Client
participant API as n8n API Server
participant Auth as Auth & Role Manager
participant Engine as Workflow Execution Engine
participant Agents as @n8n/agents SDK
participant MCP as MCP Tool Service
participant DB as Database (Postgres/SQLite)
participant OTEL as OTEL Collector
participant Ext as External APIs (LLM/OAuth/Git)
Note over UI, Ext: n8n v2.15.0 Architectural Flow Changes
rect rgb(240, 240, 240)
Note over UI, DB: NEW: RBAC Role Mapping Flow
UI->>API: POST /role-mapping-rule
API->>Auth: NEW: validateRuleScope()
Auth->>DB: NEW: Save RoleMappingRule
DB-->>UI: 201 Created (Rule saved with Order/Type uniqueness)
end
rect rgb(230, 245, 255)
Note over UI, Ext: NEW: AI Agent & LLM Execution
UI->>Engine: Trigger Agent Workflow
Engine->>Agents: NEW: Initialize Agent SDK
Agents->>Ext: CHANGED: Load OpenAI models (with custom headers)
Agents->>Ext: Basic LLM Chain Call
alt User Aborts Execution
UI->>Engine: Stop Job
Engine->>Agents: CHANGED: Propagate Abort Signal
Agents->>Ext: Cancel Request
end
end
rect rgb(240, 255, 240)
Note over Engine, Ext: CHANGED: MCP & OAuth Recovery
Engine->>MCP: Call Tool
MCP->>Ext: Request with OAuth2 Token
Ext-->>MCP: 401 Unauthorized
MCP->>MCP: CHANGED: Refresh OAuth2 Token
MCP->>Ext: Retry Request with new Token
Ext-->>Engine: Success
end
rect rgb(255, 245, 230)
Note over UI, DB: NEW: Workflow Management & Versioning
UI->>API: NEW: POST /workflows/:id/archive
API->>DB: Update Archive Status
UI->>UI: NEW: Render Inline Version Cards (Replace old Restore UI)
UI->>API: GET /diff (Source Control)
API->>Ext: Fetch Git Branch
Ext-->>API: Branch Data
API->>API: NEW: Validate Branch Name Format
end
rect rgb(250, 240, 255)
Note over Engine, OTEL: NEW: Observability & Telemetry
Engine->>OTEL: Export Workflow-level Trace
alt Trace Export Fails
OTEL->>OTEL: NEW: Safe Trace Exporter (Unhappy path handling)
end
end
UI->>API: GET /healthz
API->>API: CHANGED: Resolve path with N8N_PATH logic
API-->>UI: 200 OK
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2.15.0 (2026-03-30)
Bug Fixes
process.versionin expression sandbox (#26550) (fc0f071)/healthzendpoint when usingN8N_PATH(#27665) (4436e4b)/diffroute loading in demo mode (#27610) (197a431)Features
Performance Improvements