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# CyberStrikeAI Graph Orchestration Guide
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[中文](workflow-graph.md)
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This document explains how to use **Graph Orchestration**: building workflows on the canvas, configuring node types, passing data between nodes, and binding a graph to a role for automatic execution.
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---
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## 1. Where to find Graph Orchestration
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1. Log in to the CyberStrikeAI web UI.
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2. Open **Graph Orchestration** in the left sidebar.
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3. Select an existing workflow from the list, or create a new one.
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4. Drag nodes, draw edges, and configure properties on the canvas.
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5. Fill in **ID**, **Name**, and **Description**, then click **Save**.
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Saved workflows can be bound to a role under **Role Management**. When `workflow_policy` is `auto`, chatting with that role runs the bound graph automatically.
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---
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## 2. Canvas basics
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| Action | Description |
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|--------|-------------|
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| Add node | Click a node type button above the canvas (Start, Tool, Agent, Condition, HITL, Output, End) |
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| Connect | Click **Connect**, then click source and target nodes; click **Connect** again to exit connect mode |
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| Select | Click a node or edge; properties appear in the right panel |
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| Delete selected | Remove the current node or edge |
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| Auto layout | Rearrange node positions |
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| Delete workflow | Remove the entire workflow definition |
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**Requirements:** Every workflow needs at least **one Start node** and **one Output node**. Start nodes must not have incoming edges; Output nodes must not have outgoing edges.
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---
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## 3. Execution model (read this before configuring)
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The engine executes the workflow as a **directed graph**, starting from the **Start** node and following edges to downstream nodes.
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During a run, the engine keeps internal state. Template expressions `{{...}}` read from that state:
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| Internal state | Template prefix | Meaning |
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|----------------|-----------------|---------|
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| `inputs` | `{{inputs.xxx}}` | Workflow inputs at start (user message, conversation ID, etc.) |
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| `lastOutput` | `{{previous.xxx}}` | Output of the **most recently executed** node |
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| `outputs` | `{{outputs.xxx}}` | Global **named variable pool** (written by nodes with an output key) |
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| `nodeOutputs` | `{{nodeId.xxx}}` | Full output object of a specific node ID |
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### 3.1 What is `previous`?
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`{{previous.output}}` is the `output` field of the **immediately preceding executed node**.
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- After every node finishes, the engine updates `lastOutput`.
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- It is **not** “the node drawn upstream on the canvas”; it is **the previous step in actual execution order**.
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Example:
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```text
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Start → Agent A → Agent B
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```
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For Agent B, `{{previous.output}}` = Agent A’s output.
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With a condition in between:
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```text
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Start → Agent A → Condition → Agent B
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```
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For Agent B, `{{previous.output}}` = the **condition node** output (`true` / `false`), **not** Agent A’s result.
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### 3.2 What is `outputs`?
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`outputs` is a **named variable registry** maintained by the engine during execution.
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When an Agent, Tool, or Output node sets an **Output variable name** (`output_key`), the result is stored as:
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```text
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outputs["your_variable_name"] = node_output
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```
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Any downstream node can then reference it via `{{outputs.variable_name}}`, even if other nodes sit in between.
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Example:
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- Agent A **Output variable name**: `agent_result1`
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- Agent B **Input source**: `{{outputs.agent_result1}}`
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Agent B still receives Agent A’s output even when a condition node lies between them.
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### 3.3 When to use `previous` vs `outputs`
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| Scenario | Recommended |
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|----------|-------------|
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| Two nodes are **directly connected**; you only need the last step | `{{previous.output}}` |
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| Other nodes sit in between (condition, tool, HITL, etc.) | `{{outputs.variable_name}}` |
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| Reference output from an **earlier** node | `{{outputs.variable_name}}` or `{{nodeId.output}}` |
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| Condition should test an Agent’s output | `{{outputs.variable_name}} != ""` |
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| Read the original user input | `{{inputs.message}}` |
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**Rule of thumb:**
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- `previous` = last step (chained, adjacent)
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- `outputs` = by name (cross-node, look back)
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---
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## 4. Template syntax
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### 4.1 Basic format
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```text
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{{path.to.value}}
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```
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Allowed characters in paths: letters, digits, underscore, dot, hyphen. Examples:
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```text
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{{previous.output}}
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{{outputs.agent_result1}}
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{{inputs.message}}
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{{inputs.conversationId}}
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{{previous.matched}}
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{{node-abc123.output}}
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```
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### 4.2 Available paths
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| Path | Description |
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|------|-------------|
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| `{{inputs.message}}` | User message (Start node input) |
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| `{{inputs.conversationId}}` | Conversation ID |
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| `{{inputs.projectId}}` | Project ID |
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| `{{previous.output}}` | Primary output of the previous node |
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| `{{previous.matched}}` | Match result of the previous condition node (`true` / `false`) |
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| `{{outputs.variable_name}}` | Named output registered by a node |
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| `{{nodeId.output}}` | `output` field of the node with that ID |
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### 4.3 Condition expressions
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Condition nodes and edge conditions support simple comparisons:
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```text
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{{outputs.agent_result1}} != ""
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{{previous.output}} == "ok"
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{{outputs.count}} == "100"
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```
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Rules:
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- Use `==` or `!=` for string comparison (leading/trailing spaces and quotes are trimmed)
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- Without a comparator, non-empty values that are not `false`, `0`, or `null` are treated as true
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---
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## 5. Node types and configuration
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### 5.1 Start
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Workflow entry point; injects user input into `inputs`.
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| Field | Description | Default |
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|-------|-------------|---------|
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| Input keys | Comma-separated input key names | `message, conversationId, projectId` |
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Start node output includes: `output`, `message`, `conversationId`, `projectId`.
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### 5.2 Agent
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Runs an LLM Agent task. Supports multiple modes.
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| Field | Description | Default |
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|-------|-------------|---------|
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| Agent mode | `eino_single` / `deep` / `plan_execute` / `supervisor` | `eino_single` |
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| Input source | Template for upstream data | `{{previous.output}}` |
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| Node instruction | Task description for this node | empty |
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| Output variable name | Key written into `outputs` | `agent_result` |
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**Message assembly:**
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- Instruction only → send instruction to the Agent
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- Input source only → “Continue based on upstream output: …”
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- Both → combined “upstream input + node instruction”
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After execution:
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- `previous.output` becomes this node’s response text
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- If **Output variable name** is set, the value is also stored in `outputs[variable_name]`
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### 5.3 Tool
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Calls an enabled MCP tool.
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| Field | Description | Default |
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|-------|-------------|---------|
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| MCP tool | Tool name (required) | — |
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| Argument template | JSON with `{{...}}` templates | `{}` |
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| Timeout (seconds) | Optional | empty |
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Example argument template:
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```json
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{"target": "{{inputs.message}}", "port": "443"}
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```
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If an output variable name is configured, the tool result is written to `outputs`.
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### 5.4 Condition
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Evaluates an expression and outputs `matched` (`true` / `false`).
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| Field | Description | Default |
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|-------|-------------|---------|
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| Expression | Supports `{{...}}` and `==` / `!=` | `{{previous.output}} != ""` |
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**Branching rules:**
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- The **first outgoing edge** defaults to the **“yes”** branch (`matched == true`)
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- The **second outgoing edge** defaults to the **“no”** branch (`matched == false`)
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- Edge labels such as `是` / `否` (or `yes` / `no`, `true` / `false`) help identify branches
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- A third or later edge needs a custom **edge condition**
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Edge condition examples (select an edge, configure in the right panel):
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```text
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{{previous.matched}} == "true"
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{{previous.matched}} == "false"
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```
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### 5.5 HITL (human-in-the-loop)
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Human approval checkpoint (currently record-only; marks `approved: true` and continues).
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| Field | Description | Default |
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|-------|-------------|---------|
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| Prompt | Supports templates | `Please approve before continuing` |
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| Reviewer | `human` / `audit_agent` | `human` |
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### 5.6 Output
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Writes the final workflow result into `outputs` for summary and chat display.
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| Field | Description | Default |
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|-------|-------------|---------|
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| Output variable name | Required key for the final result | `result` |
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| Variable source | Template deciding what to write | `{{previous.output}}` |
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**Note:** Output nodes are workflow exits and must not have outgoing edges.
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### 5.7 End
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Optional node for an end summary template (less common in role-bound flows).
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| Field | Description | Default |
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|-------|-------------|---------|
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| Result template | Supports `{{outputs.xxx}}` | `{{outputs.result}}` |
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---
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## 6. Edge configuration
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Select an **edge** to configure its **condition** in the right panel.
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| Scenario | Example |
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|----------|---------|
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| Filter after a normal node | `{{previous.output}} == "ok"` |
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| “Yes” branch from a condition | `{{previous.matched}} == "true"` |
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| “No” branch from a condition | `{{previous.matched}} == "false"` |
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If no edge condition is set:
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- Non-condition nodes: edge is always allowed
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- Condition nodes: yes/no branches are assigned by edge order automatically
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---
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## 7. Full example: passing Agent output across a condition
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### 7.1 Graph structure
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```text
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Start → Agent (initial value) → Condition → Agent (transform) → Output
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↘ no → Output
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```
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### 7.2 Node configuration
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**Agent 1**
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| Field | Value |
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|-------|-------|
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| Node instruction | Output only `123333333` |
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| Output variable name | `agent_result1` |
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**Condition**
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| Field | Value |
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|-------|-------|
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| Expression | `{{outputs.agent_result1}} != ""` |
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**Agent 2**
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| Field | Value |
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|-------|-------|
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| Input source | `{{outputs.agent_result1}}` |
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| Node instruction | Add 100 to the input, then output |
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| Output variable name | `agent_result` |
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**Output**
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| Field | Value |
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|-------|-------|
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| Output variable name | `result` |
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| Variable source | `{{outputs.agent_result}}` |
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### 7.3 Common mistakes
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| Wrong config | Why it fails |
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|--------------|--------------|
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| Agent 2 input source = `{{previous.output}}` | `previous` points to the condition node → `true`/`false`, not Agent 1’s text |
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| Agent 1 has no output variable name | `outputs.agent_result1` does not exist → empty downstream |
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| Condition uses `{{previous.output}}` | Tests the wrong upstream value instead of Agent 1’s named output |
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---
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## 8. Bind to a role and run
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### 8.1 Bind in Role Management
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1. Open **Role Management**, edit or create a role.
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2. Select the workflow / graph ID to bind.
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3. Set policy to `auto` (default when `workflow_id` is set).
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4. Save the role.
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You can also configure this in role YAML:
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```yaml
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name: workflow-test
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workflow_id: "1233"
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workflow_version: latest
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workflow_policy: auto
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```
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### 8.2 Runtime behavior
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When a user chats with that role:
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1. The engine loads `graph_json` and executes the graph.
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2. The chat UI shows progress events (`workflow_start`, `workflow_node_start`, Agent reasoning, etc.).
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3. When finished, a summary lists all named entries in `outputs`.
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If no Output node is reached or no branch matches, `outputs` may be empty and the summary will suggest checking the Output node and branches.
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---
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## 9. Validation before save
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On save, the system checks:
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| Rule | Description |
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|------|-------------|
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| Start node required | At least one `start` node |
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| Output node required | At least one `output` node with an output variable name |
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| Valid edges | Source and target exist; no self-loops |
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| Start has no incoming edges | Start must not be targeted |
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| Output has no outgoing edges | Nothing after Output |
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| Tool nodes | MCP tool must be selected |
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| Condition nodes | Expression required; ideally 1–2 outgoing edges (yes/no) |
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---
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## 10. Troubleshooting
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| Symptom | Likely cause | Fix |
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|---------|--------------|-----|
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| Downstream gets empty value | Upstream has no output variable name | Set **Output variable name** on upstream; use `{{outputs.xxx}}` downstream |
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| Downstream gets `true`/`false` | Used `{{previous.output}}` while previous node is a condition | Use `{{outputs.xxx}}` instead |
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| Condition always takes “no” | Expression does not match actual output format | Check Agent output for quotes/newlines; try `!= ""` first |
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| No final output | Output node branch not reached | Verify condition wiring; ensure every path reaches an **Output** node |
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| Role chat does not run workflow | Role not bound or disabled | Check `workflow_id`, `workflow_policy: auto`, workflow `enabled: true` |
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| Tool node fails | Invalid JSON in arguments or tool disabled | Fix argument template; enable the tool in MCP settings |
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---
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## 11. Best practices
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1. **Meaningful names**: Use descriptive output variable names (`scan_result`, `parsed_targets`) instead of reusing `agent_result` everywhere.
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2. **Prefer `outputs` for cross-node data**: If a condition, tool, or HITL node might sit in between, use named variables.
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3. **Use `previous` only for direct links**: `A → B` with nothing in between is the ideal case for `{{previous.output}}`.
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4. **Conditions should reference source data**: When testing Agent output, use `{{outputs.xxx}}` unless the condition immediately follows that Agent.
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5. **Every path needs an exit**: Ensure both yes and no branches eventually reach an **Output** node (or your intended end).
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6. **Validate with a simple run**: Use fixed-string outputs to verify data flow before swapping in real business logic.
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---
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## 12. Code references (for developers)
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| Module | Path |
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|--------|------|
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| Execution engine | `internal/workflow/runner.go` |
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| Canvas UI | `web/static/js/workflows.js` |
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| Workflow API | `internal/handler/workflow.go` |
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| Role binding | `internal/config/config.go` (`workflow_id` field) |
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