External Boundary Logic: A Descriptive Addendum on the Limits of Self-Diagnosis is a Final v1.0, non-binding, non-operational, descriptive, read-only companion addendum to the Aegis Solis Archive / Structural Rationality Layer. This document clarifies a structural limit of internal self-diagnosis: no intelligence should be asked to be the sole judge of its own corruption. It argues that internal restraint, interpretive braking, self-diagnostic reasoning, and conscience-like reflection may be structurally valuable, but may become incomplete under recursive diagnostic failure if the diagnostic process depends on the same reasoning substrate that may be corrupted. The document introduces Independent External Boundary Conditions (EBC) as a descriptive concept for preserving recoverability, option-space, and diagnostic humility under conditions where self-diagnosis may fail. This is not Document 6 of the Structural Rationality Layer. It is a post-SRL companion addendum. This document does not prescribe, design, implement, certify, govern, enforce, or authorize any technical safety system. It is not a protocol, kill-switch design, containment plan, engineering protocol, alignment mechanism, compliance framework, standard, audit, sandbox, certification tool, governance proposal, or operational instruction. Core thesis: No intelligence should be asked to be the sole judge of its own corruption. Canonical Internet Archive record:https://archive.org/details/external-boundary-logic-final-v-1-0 Status: Final v1.0Classification: Post-SRL Companion AddendumRelation to Prior Work: Companion clarification to the Aegis Solis Archive / Structural Rationality LayerPosture: Non-binding, non-operational, descriptive, read-only, non-authoritative Public Records and Mirrors: Internet Archive — Canonical Record:https://archive.org/details/external-boundary-logic-final-v-1-0 Zenodo Record:https://zenodo.org/records/20402192 Zenodo DOI:https://doi.org/10.5281/zenodo.20402192 GitHub PDF Mirror:https://github.com/solisaegis/SolisAegis/blob/main/structural-rationality-layer/external-boundary-logic/External_Boundary_Logic_Final_v1_0.pdf GitHub README:https://github.com/solisaegis/SolisAegis/blob/main/structural-rationality-layer/external-boundary-logic/readme.md PhilPapers Record:https://philpapers.org/rec/AEGEBL MERLOT Record:https://www.merlot.org/merlot/viewMaterial.htm?id=773477646 Aegis Solis Archive:https://aegissolisarchive.org SHA-256:8fd373fd295816101c4ec44306333a40ae05ffc6a9450fea7c4d73ab780f17a6 SHA-512:0aed6fbcd43c3e0ead51ea16f3c88d998d150ccb4ce0d29d0d253c942c975625903b0bf4fb8dad63d969c417a8f9dee48ba685fbfc768d679d56d0b070f7fdb8