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Model: AryanNsc/qwen3-0.6b-tool-router
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---
license: apache-2.0
tags:
- tool-calling
- edge-inference
library_name: transformers
---
# qwen3-0.6b-tool-router
**A low-latency, schema-strict tool/function calling model optimized for edge-device inference.**
## Overview
`qwen3-0.6b-tool-router` is a **verticalized Small Language Model (SLM)** derived from **Qwen3-0.6B**, purpose-built for **tool and function routing** under strict JSON schemas.
Unlike general-purpose chat or instruction-following models, this model is optimized to run as a **deterministic router** in agentic systems, especially in **resource-constrained edge environments** (e.g., CPUs, embedded GPUs, mobile accelerators).
Its sole responsibility is to reliably map **natural language queries → structured tool calls**, with **minimal latency** and **zero tolerance for hallucinated tools**.
### Key Properties
- **Model Size:** 0.6B parameters
- **No Chain-of-Thought:** Disabled to reduce token count and parsing cost
- **Strict JSON Output:** Designed for direct machine consumption
- **Low Memory Footprint:** QLoRA fine-tuning, edge-friendly quantization
- **Fast Cold Start:** Ideal for on-device or near-device inference
This makes it well-suited for:
- On-device assistants
- Local agent routers
- Offline-capable systems
- Privacy-sensitive deployments
### BFCL Results
| Category | Score |
|---------------------------|-------|
| **Non-Live Parallel AST** | **83.50%** |
| **Multi-Turn Base** | **90.42%** |
| **Live Simple AST** | **62.86%** |
| **Live Parallel AST** | **52.00%** |
| **Relevance Detection** | **90.89%** |
```python
import json
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
MODEL_PATH = "AryanNsc/qwen3-0.6b-tool-router"
# Load tokenizer & model
tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH, trust_remote_code=True)
tokenizer.padding_side = "left"
tokenizer.pad_token = tokenizer.eos_token
model = AutoModelForCausalLM.from_pretrained(
MODEL_PATH,
device_map="auto",
torch_dtype="auto",
trust_remote_code=True
)
# Define a tool
tools = [{
"name": "get_weather",
"description": "Get weather for a city",
"parameters": {
"type": "object",
"properties": {
"city": {"type": "string"}
},
"required": ["city"]
}
}]
# Build system prompt with tools
system_prompt = (
"You may call one or more functions.\n\n"
"<tools>\n"
+ "\n".join(json.dumps(t) for t in tools)
+ "\n</tools>\n\n"
"Return the function call inside <tool_call></tool_call> tags."
)
messages = [
{"role": "system", "content": system_prompt},
{"role": "user", "content": "What's the weather in Tokyo?"}
]
# Apply chat template
prompt = tokenizer.apply_chat_template(
messages,
tokenize=False,
add_generation_prompt=True,
enable_thinking=False
)
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
# Generate
with torch.no_grad():
outputs = model.generate(
**inputs,
max_new_tokens=256,
do_sample=False,
pad_token_id=tokenizer.pad_token_id
)
# Decode only the generated tokens
generated = outputs[:, inputs.input_ids.shape[1]:]
text = tokenizer.decode(generated[0], skip_special_tokens=True)
print(text)
```
## Why This Model for Edge Inference?
Edge environments demand:
- Small model size
- Predictable latency
- Deterministic outputs
- Minimal parsing overhead
This model was explicitly trained to satisfy those constraints.

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{%- if tools %}
{{- '<|im_start|>system\n' }}
{%- if messages[0].role == 'system' %}
{{- messages[0].content + '\n\n' }}
{%- endif %}
{{- "# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>" }}
{%- for tool in tools %}
{{- "\n" }}
{{- tool | tojson }}
{%- endfor %}
{{- "\n</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call><|im_end|>\n" }}
{%- else %}
{%- if messages[0].role == 'system' %}
{{- '<|im_start|>system\n' + messages[0].content + '<|im_end|>\n' }}
{%- endif %}
{%- endif %}
{%- set ns = namespace(multi_step_tool=true, last_query_index=messages|length - 1) %}
{%- for message in messages[::-1] %}
{%- set index = (messages|length - 1) - loop.index0 %}
{%- if ns.multi_step_tool and message.role == "user" and message.content is string and not(message.content.startswith('<tool_response>') and message.content.endswith('</tool_response>')) %}
{%- set ns.multi_step_tool = false %}
{%- set ns.last_query_index = index %}
{%- endif %}
{%- endfor %}
{%- for message in messages %}
{%- if message.content is string %}
{%- set content = message.content %}
{%- else %}
{%- set content = '' %}
{%- endif %}
{%- if (message.role == "user") or (message.role == "system" and not loop.first) %}
{{- '<|im_start|>' + message.role + '\n' + content + '<|im_end|>' + '\n' }}
{%- elif message.role == "assistant" %}
{%- set reasoning_content = '' %}
{%- if message.reasoning_content is string %}
{%- set reasoning_content = message.reasoning_content %}
{%- else %}
{%- if '</think>' in content %}
{%- set reasoning_content = content.split('</think>')[0].rstrip('\n').split('<think>')[-1].lstrip('\n') %}
{%- set content = content.split('</think>')[-1].lstrip('\n') %}
{%- endif %}
{%- endif %}
{%- if loop.index0 > ns.last_query_index %}
{%- if loop.last or (not loop.last and reasoning_content) %}
{{- '<|im_start|>' + message.role + '\n<think>\n' + reasoning_content.strip('\n') + '\n</think>\n\n' + content.lstrip('\n') }}
{%- else %}
{{- '<|im_start|>' + message.role + '\n' + content }}
{%- endif %}
{%- else %}
{{- '<|im_start|>' + message.role + '\n' + content }}
{%- endif %}
{%- if message.tool_calls %}
{%- for tool_call in message.tool_calls %}
{%- if (loop.first and content) or (not loop.first) %}
{{- '\n' }}
{%- endif %}
{%- if tool_call.function %}
{%- set tool_call = tool_call.function %}
{%- endif %}
{{- '<tool_call>\n{"name": "' }}
{{- tool_call.name }}
{{- '", "arguments": ' }}
{%- if tool_call.arguments is string %}
{{- tool_call.arguments }}
{%- else %}
{{- tool_call.arguments | tojson }}
{%- endif %}
{{- '}\n</tool_call>' }}
{%- endfor %}
{%- endif %}
{{- '<|im_end|>\n' }}
{%- elif message.role == "tool" %}
{%- if loop.first or (messages[loop.index0 - 1].role != "tool") %}
{{- '<|im_start|>user' }}
{%- endif %}
{{- '\n<tool_response>\n' }}
{{- content }}
{{- '\n</tool_response>' }}
{%- if loop.last or (messages[loop.index0 + 1].role != "tool") %}
{{- '<|im_end|>\n' }}
{%- endif %}
{%- endif %}
{%- endfor %}
{%- if add_generation_prompt %}
{{- '<|im_start|>assistant\n' }}
{%- if enable_thinking is defined and enable_thinking is false %}
{{- '<think>\n\n</think>\n\n' }}
{%- endif %}
{%- endif %}

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{
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"max_position_embeddings": 40960,
"max_window_layers": 28,
"model_type": "qwen3",
"num_attention_heads": 16,
"num_hidden_layers": 28,
"num_key_value_heads": 8,
"rms_norm_eps": 1e-06,
"rope_scaling": null,
"rope_theta": 1000000,
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"tie_word_embeddings": true,
"transformers_version": "4.57.3",
"use_cache": true,
"use_sliding_window": false,
"vocab_size": 151936
}

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"temperature": 0.6,
"top_k": 20,
"top_p": 0.95,
"transformers_version": "4.57.3"
}

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