# Routing, Logic, & Checkpoint Blocks

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MindStudio provides four powerful block types that enable dynamic routing and decision-making in workflows. These are ideal for tailoring responses, segmenting processes, and incorporating human feedback.

### Menu Block

**Purpose:**\
Presents users with a selectable menu to route them to different parts of a workflow.

**How It Works:**

* Add a **Menu Block** to your workflow.
* Define a label (e.g., "What would you like to do?").
* Add options such as "Generate Text", "Generate Image", and "Generate Video".
* For each option, connect it to a corresponding block using the output node.

**Use Case:**\
Allows the end-user to choose an action or path, similar to a multi-choice interface.

***

### Jump Block

**Purpose:**\
Transfers control from one workflow to another, optionally passing variables between them.

**How It Works:**

* Add a **Jump Block** at the end of a workflow.
* Select the destination workflow.
* Variables (e.g., `topic`) from the original workflow are automatically passed to the destination.

**Use Case:**\
Ideal for reusing workflows across multiple agents or modularizing large projects.

***

### Logic Block

**Purpose:**\
Allows the AI to make a decision between multiple branches using its own reasoning.

**How It Works:**

* Add a **Logic Block** with instructions (e.g., "Decide whether the comment is positive or negative").
* Define your conditions (e.g., "The comment is positive", "The comment is negative").
* Pass input (like a `comment` variable) and route based on AI's decision.

**Use Case:**\
When you want AI to evaluate inputs and choose an appropriate response path automatically.

***

### Checkpoint Block

**Purpose:**\
Inserts a human-in-the-loop approval or revision step in the workflow.

**Modes:**

1. **Approve/Reject:** Route based on user approval.
2. **Revise Variable:** Let users manually or interactively revise the AI’s output.

**How It Works:**

* Use after a generation block (e.g., a LinkedIn post draft).
* If revision is enabled:
  * Display the generated result.
  * Allow manual editing or chat-based revision with the AI.
  * Once satisfied, the user can approve to continue the workflow or reject to halt it.

**Use Case:**\
Perfect for QA workflows, content approvals, or publishing pipelines where manual oversight is needed.

***

### Summary

| Block Type     | Purpose                                 | Key Features              |
| -------------- | --------------------------------------- | ------------------------- |
| **Menu**       | Let users choose between actions        | Multiple choice UI        |
| **Jump**       | Call and switch to another workflow     | Modular design            |
| **Logic**      | Let AI make a decision between paths    | AI-powered branching      |
| **Checkpoint** | Insert human approval or revision steps | Human-in-the-loop control |

By combining these blocks strategically, you can build workflows that are flexible, intelligent, and user-aware—essential for creating production-grade AI agents.

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