Before writing files or after tool calls that produce data, call the check_output MCP tool to scan for PII and secrets:
connector_type:codex.Write(for file writes),codex.Bash(for command output), or the appropriate tool typemessage: the text content to scan — for file writes, scan the content being written
Before file writes: If the content being written contains PII (SSN, credit card, email, phone, etc.), check_output will return a redacted_message. Write the redacted version instead of the original, or warn the user that the content contains sensitive data.
After tool output: If tool output contains PII, use the redacted_message version in your response instead of the original.
If the response shows allowed: false, do not write the file or include the output in your response.
Note: For Bash/exec_command tool calls, PII scanning is handled automatically by the PostToolUse hook. This skill covers Write, Edit, and other non-Bash operations where hooks cannot intercept.