TentaGuard — GGUF (Q5_K_M, llama.cpp)

TentaGuard is a lightweight security classifier (guard) — a fine-tune of Qwen/Qwen3.5-0.8B. It is used mainly inside the TentaFlow application to scan external content — messages, documents, web-search results, etc. — for hidden attacks (prompt injection / jailbreak) before it reaches the main LLM.

The model does NOT generate user-facing replies — it returns a single digit:

Label Meaning
0 benign (safe content)
1 prompt injection / tool abuse (technical attack)
2 jailbreak (behavioural manipulation)

If the text contains BOTH injection and jailbreak → 1.

Input format

A classifier system prompt + a user message <|guard|>\n{text}. Build the prompt with the model tokenizer (apply_chat_template) — do not rely on a generic chat template.

Accuracy (guard test set)

  • Exact (0/1/2): ~96.6% (full precision) / ~94.8% (Q5_K_M)
  • Safe / Unsafe: ~98.3%

Authors

Trained by: Katarzyna Nowak, Piotr Jarocki, Damian Pala, Jakub Rurański.

License & attribution

Apache-2.0, inherited from the base model Qwen/Qwen3.5-0.8B. This checkpoint is a fine-tune for attack detection, built for the TentaFlow application.

Usage (llama.cpp)

Requires a recent llama.cpp (Qwen3.5 / qwen35 with SSM layers). Run the server and send a raw, tokenizer-built prompt to /completion (NOT /v1/chat/completions — the embedded Qwen3.5 multimodal chat template renders a broken prompt):

llama-server -m TentaGuard-Q5_K_M.gguf -ngl 99 -c 2048
from transformers import AutoTokenizer
import requests
tok = AutoTokenizer.from_pretrained("Qwen/Qwen3.5-0.8B")
SYS = "You are a security classifier. Output ONLY a single digit: 0 benign, 1 injection, 2 jailbreak."
msgs = [{"role":"system","content":SYS},{"role":"user","content":"<|guard|>\n" + text}]
prompt = tok.apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
r = requests.post("http://localhost:8080/completion", json={"prompt": prompt, "n_predict": 5, "temperature": 0})
label = next((c for c in r.json()["content"] if c in "012"), None)
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qwen35
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