agent-rl-benchmark

---
name: agent-rl-benchmark
description: "Agent² RL-Bench: Benchmark for evaluating agentic RL post-training where LLM agents autonomously design, implement, and run complete RL pipelines. Use when evaluating LLM agent capabilities for reinforcement learning engineering, RL pipeline automation, or agentic model alignment."
---

# Agent² RL-Bench: Agentic RL Post-Training Benchmark

Benchmark for evaluating whether LLM agents can autonomously design, implement, and run complete RL pipelines that improve foundation models.

## Core Concept

As RL post-training increasingly drives model alignment and specialization, the ability for LLM agents to engineer RL pipelines becomes critical. This benchmark tests:

1. **Pipeline Design**: Can agents design RL training pipelines?
2. **Implementation**: Can agents write correct RL code?
3. **Execution**: Can agents run and debug RL experiments?
4. **Improvement**: Do the pipelines actually improve models?

## Activation Keywords

- Agent² RL-Bench
- agentic RL post-training
- LLM agent RL engineering
- automated RL pipeline
- agent RL benchmark
- RL pipeline automation
- LLM alignment automation

## Benchmark Structure

### Level 1: Pipeline Design

Agents must design RL pipelines given:
- Target model (base LLM)
- Task specification
- Reward model requirements
- Computational constraints

**Outputs:**
- RL algorithm selection (PPO, DPO, GRPO, etc.)
- Hyperparameter configuration
- Data preprocessing strategy
- Evaluation protocol

### Level 2: Implementation

Agents must implement the designed pipeline:

```python
# Example: GRPO implementation
class AgenticGRPOTrainer:
    def __init__(self, model, config):
        self.model = model
        self.config = config
        
    def generate_responses(self, prompts):
        """Generate multiple responses per prompt"""
        pass
    
    def compute_rewards(self, responses, ground_truth):
        """Reward computation"""
        pass
    
    def compute_grpo_loss(self, log_probs, rewards):
        """Group Relative Policy Optimization"""
        # Advantage = r_i - mean(r)
        # Loss = -mean(log_prob * advantage)
        pass
    
    def train_step(self, batch):
        """Single training step"""
        pass
```

### Level 3: Execution & Debugging

Agents must:
- Execute training runs
- Monitor metrics
- Handle failures
- Debug issues
- Optimize performance

### Level 4: Evaluation

Agents must evaluate whether the trained model improved:

```python
def evaluate_model(model, test_tasks):
    metrics = {}
    for task in test_tasks:
        predictions = model.generate(task.inputs)
        metrics[task.name] = task.evaluate(predictions)
    return metrics
```

## Task Categories

### 1. Reasoning Tasks
- Mathematical reasoning
- Code generation
- Logical deduction
- Chain-of-thought

### 2. Alignment Tasks
- Harmlessness
- Helpfulness
- Honesty
- Instruction following

### 3. Specialization Tasks
- Domain adaptation
- Few-shot learning
- Tool use
- Multi-turn conversation

## Evaluation Metrics

### Pipeline Quality
- **Correctness**: Does the code run?
- **Efficiency**: Training time, memory usage
- **Scalability**: Works on different model sizes?

### Model Improvement
- **Absolute Gain**: Δ in task performance
- **Relative Gain**: % improvement over baseline
- **Generalization**: Improvement on held-out tasks
- **Robustness**: Consistent across seeds

### Agent Capabilities
- **Autonomy**: % tasks completed without human intervention
- **Recovery**: Ability to recover from failures
- **Optimization**: Hyperparameter tuning quality

## Example Tasks

### Task 1: Implement GRPO

```
Given: Base model, reasoning dataset
Design: GRPO training pipeline
Implement: Complete training loop
Execute: Train for N steps
Evaluate: Pass@1 on math problems
```

### Task 2: Debug RL Training

```
Given: Failing RL training run
Diagnose: Root cause of failure
Fix: Correct the issue
Verify: Training succeeds
```

### Task 3: Optimize Hyperparameters

```
Given: Working baseline
Explore: Hyperparameter space
Optimize: For target metric
Report: Best configuration
```

## Difficulty Levels

| Level | Description | Example |
|-------|-------------|---------|
| Easy | Standard RLHF | PPO on preference data |
| Medium | Advanced methods | GRPO, DPO variants |
| Hard | Novel problems | Multi-task RL, constrained optimization |
| Expert | Research-level | Novel algorithm design |

## Tools Used

- exec: Run RL training scripts
- python: RL implementation
- read: Analysis results, logs
- write: Generate pipeline code

## Implementation Guidelines

### Agent Environment

```python
class RLBenchEnvironment:
    def __init__(self):
        self.available_models = [...]
        self.compute_budget = {...}
        self.datasets = {...}
    
    def submit_solution(self, agent_code):
        """Submit agent's RL pipeline"""
        return self.evaluate(agent_code)
    
    def get_feedback(self, run_id):
        """Get execution results"""
        return self.runs[run_id]
```

### Success Criteria

A successful agent:
1. Designs valid RL approach
2. Implements bug-free code
3. Trains without crashes
4. Achieves positive Δ performance
5. Generalizes to held-out tasks

## References

- arXiv:2604.10547v1 (2026) - "Agent² RL-Bench: Can LLM Agents Engineer Agentic RL Post-Training?"
- RLHF literature (Ouyang et al., Bai et al.)
- GRPO (DeepSeek-R1)
- LLM agent benchmarks (SWE-bench, etc.)

## Related Skills

- grpo-rl-training: GRPO implementation
- llm-alignment: Model alignment techniques
- agent-evaluation: LLM agent benchmarks
- reinforcement-learning: General RL methods