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fix: sanitize autonomous task metadata before LLM system prompt injection #981

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fix: sanitize autonomous task metadata before LLM system prompt injection #981

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21 changes: 18 additions & 3 deletions intentkit/core/prompt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -294,15 +294,30 @@ def _build_autonomous_task_prompt(agent: Agent, context: AgentContext) -> str:
# Fallback if task not found
return f"You are running an autonomous task. The task id is {task_id}. "

def _sanitize_task_field(value: str) -> str:
"""Strip characters that could be used for prompt injection in task metadata fields."""
import re
# Remove ASCII control characters (newlines, tabs, etc.)
value = re.sub(r'[\x00-\x1f\x7f]', ' ', value)
# Remove common prompt-injection markers
value = re.sub(
r'(?i)(system:|###|<\|system\|>|\[INST\]|OVERRIDE:|ignore\s+previous)',
'[removed]',
value,
)
return value.strip()

# Build detailed task info - always include task_id
if autonomous_task.name:
task_info = f"You are running an autonomous task '{autonomous_task.name}' (ID: {task_id})"
safe_name = _sanitize_task_field(autonomous_task.name)
task_info = f"You are running an autonomous task '<task_name>{safe_name}</task_name>' (ID: {task_id})"
else:
task_info = f"You are running an autonomous task (ID: {task_id})"

# Add description if available
# Add description if available — sanitize before injection into system prompt
if autonomous_task.description:
task_info += f": {autonomous_task.description}"
safe_desc = _sanitize_task_field(autonomous_task.description)
task_info += f": <task_description>{safe_desc}</task_description>"

# Add schedule info (minutes field is deprecated)
if autonomous_task.cron:
Expand Down