Qwen2.5-0.5B-PromptBus-v1: Inter-Agent Prompt Bus & Dispatch Router

Lead Architect: Bhavanam Rajendra Reddy (Runtime-Slayers | ORCID: 0009-0005-3349-1162)
Organization: Runtime-Slayers
Parameter Footprint: 492 Million
Base Architecture: Qwen/Qwen2.5-0.5B-Instruct
Weight Surgery Protocol: Gram-Schmidt Subspace Null-Space Model Editing (Zero-Forgetting $\Delta W \cdot V_{\text{base}} = 0$)

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1. Overview & Specialization

High-throughput, low-latency inter-agent communication router managing JSON-RPC schemas, intent dispatching, and sub-symbolic message routing.

Part of the Runtime-Slayers Autonomous SLM Swarm Engine, operating in coordination with frontier orchestrators (NVIDIA Nemotron-3-Ultra 550B, DeepSeek V4.1, GLM-5.3, MiniMax M3.1, and Kimi K3.1 Pro) and the Google Research Harness² recursive optimization framework.

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2. Quickstart Inference Example

import torch
from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "BRR1154/Qwen2.5-0.5B-PromptBus-v1"

tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(
    model_id,
    torch_dtype=torch.float32,
    device_map="auto"
)

messages = [{"role": "user", "content": "Execute domain task."}]
inputs = tokenizer.apply_chat_template(messages, tokenize=True, add_generation_prompt=True, return_tensors="pt").to(model.device)

outputs = model.generate(inputs, max_new_tokens=256, temperature=0.2)
print(tokenizer.decode(outputs[0][inputs.shape[1]:], skip_special_tokens=True))

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📊 Empirical Academic Benchmarks & Evaluation Realities

1. Official Foundation Baselines (Qwen2.5-0.5B-Instruct Technical Report, 2024):

2. Surgical Weight Editing Protocol:

• Null-Space Projection: Parameter updates $\Delta W$ were projected onto the orthogonal null space of base activation covariances ($V_{\text{base}}$) such that $\Delta W \cdot V_{\text{base}} = 0$.
• Zero Catastrophic Forgetting: Base conversational and instruction-following capability is mathematically preserved while domain representations are calibrated.

3. Empirical Capacity Boundaries:

• At 492M parameters, autonomous multi-step reasoning and deep error self-correction are constrained.
• In production, this model is designed to operate within a closed-loop execution harness (interfacing with headless MATLAB R2024b, Blender 5.1, or Python) where execution errors are intercepted and rectified iteratively.

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3. Citation

@misc{reddy2026qwen2_5_0_5b_promptbus_v1,
  author = {Reddy, Bhavanam Rajendra},
  title = {Qwen2.5-0.5B-PromptBus-v1: Inter-Agent Prompt Bus & Dispatch Router},
  year = {2026},
  publisher = {Hugging Face},
  howpublished = {\url{https://huggingface.co/BRR1154/Qwen2.5-0.5B-PromptBus-v1}}
}