Preventing Data Leaks in Claude Code with Cedar Policy

Sondera published a technical implementation guide for securing Claude Code using Cedar, Amazon's policy-as-code authorization language, via agent harness hooks that intercept and evaluate tool calls before execution. The approach enforces fine-grained, attribute-based access control to block sensitive data exfiltration risks amplified by large context windows in frontier coding agents. Security engineers building agentic pipelines should prioritize this pattern as traditional perimeter controls fail against in-process data leakage vectors unique to LLM tool-use architectures.