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fix(security-guidance): output structured JSON so model receives security warnings #29097

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fix(security-guidance): output structured JSON so model receives security warnings #29097

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13 changes: 10 additions & 3 deletions plugins/security-guidance/hooks/security_reminder_hook.py
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Original file line number Diff line number Diff line change
Expand Up @@ -268,9 +268,16 @@ def main():
shown_warnings.add(warning_key)
save_state(session_id, shown_warnings)

# Output the warning to stderr and block execution
print(reminder, file=sys.stderr)
sys.exit(2) # Block tool execution (exit code 2 for PreToolUse hooks)
# Output structured JSON to stdout so the model receives the warning
output = {
"hookSpecificOutput": {
"hookEventName": "PreToolUse",
"permissionDecision": "deny"
},
"systemMessage": reminder
}
print(json.dumps(output))
sys.exit(0)

# Allow tool to proceed
sys.exit(0)
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