MCP Audit Logging: What CISOs Must Track

MCP audit logging captures Model Context Protocol tool calls, approvals, configuration changes, identities, policy decisions, and outcomes so organizations can determine which agent acted for which user, with what tool, and whether the action was authorized. The guidance recommends logging end-user and agent identities, server and tool details, definition hashes, redacted arguments, credential scopes, approvals, results, and trace IDs, while excluding secrets and unnecessary personal data through source redaction, hashing, and tiered access controls. It argues that centralized client- or gateway-controlled logging is preferable because the MCP logging utility is deprecated and server-generated logs may not provide independent audit evidence. Structured records sent to a SIEM can support detection of unapproved “shadow” servers, altered tool definitions, data exfiltration, privilege misuse, and approval bypasses. These logs can also provide evidence for obligations and controls associated with the EU AI Act, SOC 2, and ISO/IEC 42001, with high-risk AI systems subject to specified logging and retention requirements. The recommended implementation sequence is to first achieve coverage of remote and local MCP activity, then create detections and response ownership, and finally establish retention, review, and audit documentation.

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