---
title: "Engineering Loop: LangGraph Reflexion Deterministic State Machine (Actor-Evaluator-Reviser)"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/loop-langgraph-reflexion-deterministic-state-machine-actor-evaluator-reviser"
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: LangGraph Reflexion Deterministic State Machine (Actor-Evaluator-Reviser)

**Summary:** Engineering Loop: LangGraph Reflexion Deterministic State Machine (Actor-Evaluator-Reviser) is a verified ENGINEERING LOOP blueprint on Promptally in Test-Driven Repair Loops optimized for leading AI models. Deterministic implementation of the Reflexion architecture in LangGraph: Actor produces output - Evaluator scores against ground truth/rubric - Reviser reflects on critique - Conditional loop back until quality threshold is met. 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 | 274 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```yaml
[
  {
    "stage_index": 1,
    "name": "Initial Execution (Node: draft)",
    "action_type": "code_modification",
    "description": "Actor node generates initial solution or response."
  },
  {
    "stage_index": 2,
    "name": "Deterministic Evaluation (Node: evaluate)",
    "action_type": "output_validation",
    "description": "Evaluator checks solution against automated test assertions, regex criteria, or rubric scores."
  },
  {
    "stage_index": 3,
    "name": "Self-Reflection Synthesis (Node: reflect)",
    "action_type": "inspection",
    "description": "If evaluation fails, reflection node synthesizes a critique identifying specific flaws and corrective strategies."
  },
  {
    "stage_index": 4,
    "name": "Revision Node (Node: revise)",
    "action_type": "code_modification",
    "description": "Reviser incorporates critique and reflection to generate improved candidate."
  },
  {
    "stage_index": 5,
    "name": "Conditional Loop Edge",
    "action_type": "stop_evaluation",
    "description": "Branches to END if score threshold met or loops back to evaluate."
  }
]
```

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

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