---
title: "Engineering Loop: Loop-Engine Directed Acyclic Graph (DAG) State Transition Engine"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/loop-loop-engine-directed-acyclic-graph-dag-state-transition-engine"
modality: "ENGINEERING_LOOP"
category: "Test-Driven Repair Loops"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Engineering Loop: Loop-Engine Directed Acyclic Graph (DAG) State Transition Engine

**Summary:** Engineering Loop: Loop-Engine Directed Acyclic Graph (DAG) State Transition Engine is a verified ENGINEERING LOOP blueprint on Promptally in Test-Driven Repair Loops optimized for leading AI models. Graph-based state machine defining nodes, typed transitions, validation predicates, and fallback edges for autonomous agent workflows. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | ENGINEERING_LOOP |
| Category | Test-Driven Repair Loops |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 194 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```yaml
[
  {
    "stage_index": 1,
    "name": "Node Selection & Readiness Check",
    "action_type": "setup",
    "description": "Identify unblocked nodes whose inbound dependency edges have succeeded."
  },
  {
    "stage_index": 2,
    "name": "Transition Execution",
    "action_type": "dispatch",
    "description": "Execute node payload and produce candidate next state."
  },
  {
    "stage_index": 3,
    "name": "Predicate Edge Evaluation",
    "action_type": "output_validation",
    "description": "Evaluate boolean edge predicates to determine transition route."
  },
  {
    "stage_index": 4,
    "name": "Fallback Routing on Failure",
    "action_type": "retry",
    "description": "If node execution fails, route through dedicated error/fallback recovery edges."
  }
]
```

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

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