Tool Output Entropy Sanitizer MCP Connector for Claude

The Tool Output Entropy Sanitizer is a security-focused MCP server designed to prevent sensitive data leakage into LLM context windows. By implementing a sliding-window analysis, the sanitize_text_output tool scans input strings for segments that exceed an entropy threshold of 4.5. It uses deterministic character frequency analysis to identify high-entropy patterns characteristic of API keys, passwords, or encoded payloads. The server also provides evaluate_segment_entropy to audit specific substrings and verify_window_bounds to ensure window sizes remain within the operational bounds of 16 to 64 characters. When a secret is detected, it is replaced with a structured redaction pattern like [REDACTED_HIGH_ENTROPY:length], preserving the structural context for the AI while protecting sensitive information.