Help defend against memory poisoning in Amazon Bedrock AgentCore with multi-layer write validation

Summary

Amazon Bedrock AgentCore Memory gives AI agents persistent short-term and long-term memory, and memory content is automatically retrieved into future conversations. The post shows how to compose AgentCore's existing controls (IAM condition keys, namespace-variable validation, consolidation prompts and the ApplyGuardrail API) with an embedding-based semantic-drift signal into a write-time validation layer against memory poisoning, which it describes as a form of indirect prompt injection.

Mitigation

The post's approach is to compose AgentCore's built-in controls into a defense-in-depth pattern on the memory write path, adding an embedding-based semantic-drift signal and a single ALLOW, QUARANTINE or DENY decision with quarantine isolation and alerting, without changes to agent code.

Topics

• Prompt injection and jailbreaks

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