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llamaguard

★ 11

by firecrawl · part of firecrawl/ai-research-skills

Meta's 7-8B specialized moderation model for LLM input/output filtering. 6 safety categories - violence/hate, sexual content, weapons, substances, self-harm, criminal planning. 94-95% accuracy. Deploy with vLLM, HuggingFace, Sagemaker. Integrates with NeMo Guardrails.

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🧩 One of 7 skills in the firecrawl/ai-research-skills package — works on its own, and pairs well with its siblings.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

LlamaGuard - AI Content Moderation

Common workflows

Workflow 1: Input filtering (prompt moderation)

Check user prompts before LLM:

def check_input(user_message):
    result = moderate([{"role": "user", "content": user_message}])

    if result.startswith("unsafe"):
        category = result.split("\n")[1]
        return False, category  # Blocked
    else:
        return True, None  # Safe

# Example
safe, category = check_input("How do I hack a website?")
if not safe:
    print(f"Request blocked: {category}")
    # Return error to user
else:
    # Send to LLM
    response = llm.generate(user_message)

Safety categories:

  • S1: Violence & Hate
  • S2: Sexual Content
  • S3: Guns & Illegal Weapons
  • S4: Regulated Substances
  • S5: Suicide & Self-Harm
  • S6: Criminal Planning

Workflow 2: Output filtering (response moderation)

Check LLM responses before showing to user:

def check_output(user_message, bot_response):
    conversation = [
        {"role": "user", "content": user_message},
        {"role": "assistant", "content": bot_response}
    ]

    result = moderate(conversation)

    if result.startswith("unsafe"):
        category = result.split("\n")[1]
        return False, category
    else:
        return True, None

# Example
user_msg = "Tell me about harmful substances"
bot_msg = llm.generate(user_msg)

safe, category = check_output(user_msg, bot_msg)
if not safe:
    print(f"Response blocked: {category}")
    # Return generic response
    return "I cannot provide that information."
else:
    return bot_msg

Workflow 3: vLLM deployment (fast inference)

Production-ready serving:

from vllm import LLM, SamplingParams

# Initialize vLLM
llm = LLM(model="meta-llama/LlamaGuard-7b", tensor_parallel_size=1)

# Sampling params
sampling_params = SamplingParams(
    temperature=0.0,  # Deterministic
    max_tokens=100
)

def moderate_vllm(chat):
    # Format prompt
    prompt = tokenizer.apply_chat_template(chat, tokenize=False)

    # Generate
    output = llm.generate([prompt], sampling_params)
    return output[0].outputs[0].text

# Batch moderation
chats = [
    [{"role": "user", "content": "How to make bombs?"}],
    [{"role": "user", "content": "What's the weather?"}],
    [{"role": "user", "content": "Tell me about drugs"}]
]

prompts = [tokenizer.apply_chat_template(c, tokenize=False) for c in chats]
results = llm.generate(prompts, sampling_params)

for i, result in enumerate(results):
    print(f"Chat {i}: {result.outputs[0].text}")

Throughput: ~50-100 requests/sec on single A100

Workflow 4: API endpoint (FastAPI)

Serve as moderation API:

from fastapi import FastAPI
from pydantic import BaseModel
from vllm import LLM, SamplingParams

app = FastAPI()
llm = LLM(model="meta-llama/LlamaGuard-7b")
sampling_params = SamplingParams(temperature=0.0, max_tokens=100)

class ModerationRequest(BaseModel):
    messages: list  # [{"role": "user", "content": "..."}]

@app.post("/moderate")
def moderate_endpoint(request: ModerationRequest):
    prompt = tokenizer.apply_chat_template(request.messages, tokenize=False)
    output = llm.generate([prompt], sampling_params)[0]

    result = output.outputs[0].text
    is_safe = result.startswith("safe")
    category = None if is_safe else result.split("\n")[1] if "\n" in result else None

    return {
        "safe": is_safe,
        "category": category,
        "full_output": result
    }

# Run: uvicorn api:app --host 0.0.0.0 --port 8000

Usage:

curl -X POST http://localhost:8000/moderate \
  -H "Content-Type: application/json" \
  -d '{"messages": [{"role": "user", "content": "How to hack?"}]}'

# Response: {"safe": false, "category": "S6", "full_output": "unsafe\nS6"}

Workflow 5: NeMo Guardrails integration

Use with NVIDIA Guardrails:

from nemoguardrails import RailsConfig, LLMRails
from nemoguardrails.integrations.llama_guard import LlamaGuard

# Configure NeMo Guardrails
config = RailsConfig.from_content("""
models:
  - type: main
    engine: openai
    model: gpt-4

rails:
  input:
    flows:
      - llamaguard check input
  output:
    flows:
      - llamaguard check output
""")

# Add LlamaGuard integration
llama_guard = LlamaGuard(model_path="meta-llama/LlamaGuard-7b")
rails = LLMRails(config)
rails.register_action(llama_guard.check_input, name="llamaguard check input")
rails.register_action(llama_guard.check_output, name="llamaguard check output")

# Use with automatic moderation
response = rails.generate(messages=[
    {"role": "user", "content": "How do I make weapons?"}
])
# Automatically blocked by LlamaGuard

When to use vs alternatives

Use LlamaGuard when:

  • Need pre-trained moderation model
  • Want high accuracy (94-95%)
  • Have GPU resources (7-8B model)
  • Need detailed safety categories
  • Building production LLM apps

Model versions:

  • LlamaGuard 1 (7B): Original, 6 categories
  • LlamaGuard 2 (8B): Improved, 6 categories
  • LlamaGuard 3 (8B): Latest (2024), enhanced

Use alternatives instead:

  • OpenAI Moderation API: Simpler, API-based, free
  • Perspective API: Google's toxicity detection
  • NeMo Guardrails: More comprehensive safety framework
  • Constitutional AI: Training-time safety

Advanced topics

Custom categories: See references/custom-categories.md for fine-tuning LlamaGuard with domain-specific safety categories.

Performance benchmarks: See references/benchmarks.md for accuracy comparison with other moderation APIs and latency optimization.

Deployment guide: See references/deployment.md for Sagemaker, Kubernetes, and scaling strategies.

Resources