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# API Reference — Implementing LLM Access Controls

## Rate Limiting with Redis
```python
import redis

client = redis.from_url("redis://localhost")
pipe = client.pipeline()
pipe.incr(f"ratelimit:req:{user_id}")
pipe.expire(f"ratelimit:req:{user_id}", 3600)
pipe.incrby(f"ratelimit:tok:{user_id}", tokens_used)
pipe.expire(f"ratelimit:tok:{user_id}", 3600)
pipe.execute()
```

## JWT-Based Authentication
```python
import jwt

payload = jwt.decode(token, public_key, algorithms=["RS256"])
user_role = payload.get("role", "user")
```

## Tool Permission Check
```python
TOOL_PERMISSIONS = {
    "search_docs": {"risk": "read_only", "roles": ["user", "admin"]},
    "execute_code": {"risk": "destructive", "roles": ["admin"]},
}

def is_authorized(tool: str, role: str) -> bool:
    perm = TOOL_PERMISSIONS.get(tool)
    return perm is not None and role in perm["roles"]
```

## Audit Logging
```python
import logging, json
from datetime import datetime, timezone

logger = logging.getLogger("llm_audit")
logger.info(json.dumps({
    "timestamp": datetime.now(timezone.utc).isoformat(),
    "user_id": user_id,
    "tools_used": tool_calls,
}))
```
