Core Blocks

Core blocks are the fundamental processing units in Zelaxy. They handle AI reasoning, control flow, data transformation, and workflow orchestration. Every workflow uses at least a Starter block and typically an Agent block.

Block Categories

AI & Reasoning

Block	Description	Use When
Agent	Multi-provider LLM with tool calling	You need AI reasoning, generation, or analysis
Thinking	Forces step-by-step reasoning	You want to improve an agent's chain-of-thought
Evaluator	Score and assess content quality	You need to rate, rank, or evaluate outputs
Translate	Multi-language translation	You need to convert text between languages

Control Flow

Block	Description	Use When
Condition	Boolean or LLM-based branching	You need IF/ELSE logic in your workflow
Router	Multi-path routing (up to 4 paths)	You need to route to 3+ different paths
Loop	Iterate over arrays or repeat N times	You need to process items one by one
Parallel	Run multiple blocks simultaneously	You need to run independent tasks concurrently

Data & I/O

Block	Description	Use When
Starter	Workflow entry point	Every workflow needs one as the first block
Response	Return final output	You want to display or return the workflow result
Function	Execute custom JavaScript/TypeScript	You need custom data transformation logic
API	Make HTTP requests to any API	You need to call an external REST API

Knowledge & Memory

Block	Description	Use When
Knowledge	Vector search across documents	You need RAG (retrieval-augmented generation)
Memory	Persistent data storage	You need to store/retrieve data across runs

Safety & Quality

Block	Description	Use When
Guardrails	Validate content (JSON, regex, PII, hallucination)	You need to check output quality or safety

Media & Files

Block	Description	Use When
Image Generator	Generate images with DALL-E 3 / GPT Image	You need to create images from text prompts
Vision	Analyze images with vision models	You need to extract information from images
File	Parse PDF, CSV, DOCX files	You need to read and extract file contents

Orchestration

Block	Description	Use When
Workflow	Execute another workflow as a sub-workflow	You want to reuse workflows as building blocks

How Blocks Connect

Every block has inputs and outputs. You reference outputs using the {{blockName.fieldName}} syntax:

Starter → Agent → Condition
         ↓
   {{starter.input}}    →  Agent processes it
                          {{agent.content}}  →  Condition evaluates it

Blocks auto-detect connections when you draw lines between them on the canvas.

Core Blocks

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