Redacting PII at Write Time in MCP Server Logs

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An MCP server should pass each log entry through a redaction layer before writing it, so personal data and secrets never appear in plaintext. Logs are copied into monitoring systems, archives, and exports and often outlive the original request, so one unmasked line can spread widely. Field-level rules work best: keeping an email's domain, a card's last four digits, and replacing Authorization headers with a fixed marker, ideally applied while data is still structured. Pattern matching can catch sensitive values in free text, and limiting logged request and response bodies reduces exposure in the first place. Because the server controls only its own logs, this is one layer of protection, and running a test request to inspect the output is recommended to verify masking.

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