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Official Repository for The Paper: AgentStream: How Well Do Self-Evolving LLM Agents Perform Under Streaming Tasks?

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<h1>AgentStream: How Well Do Self-Evolving LLM Agents Perform Under Streaming Tasks?</h1>

Dong Yan1,2,3,
 Jian Liang1,3†,
 Dapeng Hu2†,
 Ran He1,3,
 Nicholas Jing Yuan2,
 Qi Zhang2,
 Tieniu Tan1,3,4

1School of Artificial Intelligence, University of Chinese Academy of Sciences 
 2Microsoft 
 3Institute of Automation, Chinese Academy of Sciences 
 4Nanjing University

📧 <code>liangjian92@gmail.com</code> &nbsp;
 <code>dapenghu@microsoft.com</code>

</div>

## 🚀 News
* **[2026/08]** Code is released!
* **[2026/07]** Code is under preparation. Stay tuned!

## 📖 Overview
Large language model (LLM) agents can self-evolve by continually improving from their own accumulated experience.
However, existing studies predominantly adopt independent evaluation.
Consequently, the behavior of self-evolving agents in realistic streaming settings, where agents adapt to diverse and complex task streams, remains poorly understood.
To address this gap, we introduce AgentStream, a unified framework that evaluates self-evolving agents spanning diverse evolution components by organizing agentic benchmarks into a configurable task stream and instantiating the `Isolated`, `Sequential`, and `Interleaved` streaming scenarios at test time, which progressively vary the scope and domain composition of the stream.
Over these scenarios, we combinatorially evaluate five representative self-evolving methods across three frontier foundation models, disentangling how model capability, method architecture, and streaming scenario jointly shape self-evolution.
Our results show that self-evolution reliability varies across streaming scenarios, the benefit of self-evolution is gated by model capability and non-monotonic in model strength, and no single method dominates across models and scenarios.
These findings offer concrete guidance for selecting self-evolving methods across models and streaming scenarios.
Overall, we advocate that self-evolving agents should be evaluated under realistic task streams rather than isolated single-task settings.

## ⚡️ Getting Started

AgentStream is built on the [`Exgentic`](./exgentic) framework, which is bundled in this repository. The five self-evolving agents live under [`exgentic/src/exgentic/agents`](./exgentic/src/exgentic/agents), and the benchmarks are orchestrated through `exgentic`'s installation and runner infrastructure.

### 1. Requirements

- Python `>= 3.11`
- [`uv`](https://github.com/astral-sh/uv)
- Docker (optional)

### 2. Install the local exgentic (agent side)

Clone the repo and create an editable environment from the bundled `exgentic`:

```bash
git clone https://github.com/Jasper-Yan/AgentStream.git
cd AgentStream/exgentic

# Install the local ./src/exgentic in editable mode into .venv/
uv sync

# Activate the environment
source .venv/bin/activate
```

Verify that the self-evolving agents are visible from the local install:

```bash
uv run exgentic list agents
```

### 3. Install benchmarks (benchmark side)

Each benchmark is installed into isolated **`venv`** environment:

```bash
cd AgentStream/exgentic

uv run exgentic install --benchmark tau2
uv run exgentic install --benchmark bfcl
uv run exgentic install --benchmark hle
uv run exgentic install --benchmark appworld
uv run exgentic install --benchmark swebench
uv run exgentic install --benchmark browsecompplus
```

### 4. API credentials

The runners call LLMs through [LiteLLM](https://docs.litellm.ai/). Set the credentials for your provider in the [`exgentic/scripts/<method>/run_experiment.sh`](./exgentic/scripts/ace/run_experiment.sh):

```bash
export OPENAI_API_KEY="..."
export OPENAI_API_BASE="..."
```

### 5. Run the streaming experiments

Each method has its own runner under [`exgentic/scripts/<method>`](./exgentic/scripts). The shell script selects the streaming scenario via `MODE` (`isolated` | `sequential` | `interleaved`), the model, the seed, and the benchmark stream:

```bash
cd AgentStream/exgentic/scripts/ace

bash run_experiment.sh
```

## 🙏 Acknowledgement
This work is based on [Exgentic](https://github.com/Exgentic/exgentic). We sincerely thank the authors and contributors of these excellent open-source projects.

## 📚 Citation
If you find our work helpful, please consider citing:

```bibtex
@article{yan2026agentstream,
  title={AgentStream: How Well Do Self-Evolving LLM Agents Perform Under Streaming Tasks?},
  author={Yan, Dong and Liang, Jian and Hu, Dapeng and He, Ran and Yuan, Nicholas Jing and Zhang, Qi and Tan, Tieniu},
  journal={arXiv preprint arXiv:2608.00155},
  year={2026}
}
```

## 📄 License

This project is licensed under the Apache License 2.0.

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