Workflow Nodes

DocsGPT workflows are composed of Nodes that are connected to form a processing graph. These nodes interact with a Shared State—a global dictionary of variables that persists throughout the execution of the workflow.

The Shared State

Every workflow run maintains a state object (a JSON-like dictionary).

• Initial State: Contains the user’s input query ({{query}}) and chat history ({{chat_history}}).
• Accessing Variables: You can access any variable in the state using the double-curly braces syntax: {{variable_name}}.
• Modifying State: Nodes read from this state and write their outputs back to it.

AI Agent Node

The AI Agent Node is the core processing unit. It uses a Large Language Model (LLM) to generate text, answer questions, or perform tasks using tools.

Inputs (Template Variables)

The primary input is the Prompt Template. This field supports variable substitution.

• Prompt Template: The text sent to the model.
  • Example: "Summarize the following text: {{user_input_text}}"
  • If left empty, it defaults to the initial user query ({{query}}).
• System Prompt: Instructions that define the agent’s persona and constraints.
• Tools: A list of tools the agent can use (e.g., search, calculator).
• LLM Settings: Specific provider, model name, and parameters.

Outputs (Emissions)

When the agent completes its task, it stores the result in the shared state.

• Output Variable: The name of the variable where the result will be saved.
  • Default: If not specified, it is saved as node_{node_id}_output.
  • Custom: You can set this to something meaningful, like summary or translated_text.
• Streaming: If “Stream to user” is enabled, the output is sent to the user in real-time as it is generated, in addition to being saved to the state.

Set State Node

The Set State Node allows you to manipulate variables within the shared state directly without calling an LLM. This is useful for initialization, formatting, or control flow logic.

Operations

You can define multiple operations in a single node. Each operation targets a specific Key (variable name).

1. Set: Assigns a specific value to a variable.

   • Value: Can be a static string or a template using variables.
   • Example: Set current_step to 1.
   • Example: Set formatted_response to Analysis: {{analysis_result}}.

2. Increment: Increases the value of a numeric variable.

   • Value: The amount to add (default is 1).
   • Example: Increment retry_count by 1.

3. Append: Adds a value to a list variable.

   • Value: The item to add to the list.
   • Example: Append {{last_result}} to history_list.

Usage Examples

• Loop Counters: Use a Set State node to initialize a counter (i = 0) before a loop, and another to increment it inside the loop.
• Accumulators: Use Append to collect results from multiple parallel branches into a single list.
• Renaming: Copy the output of a previous node to a more generic name (e.g., set context to {{search_results}}) so subsequent nodes can use a standard variable name.