Claude Opus 4.6 / Gpt-5.5 specimen: Return Surface Analysis is a defensive security review heuristic for finding risk in the less-analyzed direction of a system: the path by which data, metadata, errors, artifacts, or tool output returns from a boundary-crossing operation.
security skills application-security threat-modeling api-security vulnerability-research defensive-security secure-code-review llm-security output-validation trust-boundaries trust-differential
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Updated
May 20, 2026