diff --git a/docs_build/dev/ProjectInstructions/README.txt b/docs_build/dev/ProjectInstructions/README.txt
index a520a1f2c..c1b401225 100644
--- a/docs_build/dev/ProjectInstructions/README.txt
+++ b/docs_build/dev/ProjectInstructions/README.txt
@@ -46,3 +46,4 @@ Addendum index:
 - Test Structure Standardization: project-instructions/addendums/test-structure-standardization.md
 - Legacy Migration Policy: project-instructions/addendums/legacy-migration-policy.md
 - Assistant Execution Modes: project-instructions/addendums/assistant-execution-modes.md
+- Codex Artifact and Reporting Standard: project-instructions/addendums/codex-artifact-and-reporting-standard.md
diff --git a/project-instructions/addendums/codex-artifact-and-reporting-standard.md b/project-instructions/addendums/codex-artifact-and-reporting-standard.md
new file mode 100644
index 000000000..3f16a3641
--- /dev/null
+++ b/project-instructions/addendums/codex-artifact-and-reporting-standard.md
@@ -0,0 +1,66 @@
+# Codex Artifact and Reporting Standard
+
+## Purpose
+
+Standardize Codex deliverables, completion reporting, and artifact generation.
+
+## ZIP Artifact Requirement
+
+Every Codex task must produce a ZIP artifact.
+
+Applies to:
+- Success
+- Failure
+- Stop Gate
+- Partial Completion
+- Review Deliverables
+- Governance Deliverables
+
+Minimum ZIP contents:
+- summary.md
+
+Optional:
+- changed-files.txt
+- findings.md
+- validation.txt
+- generated artifacts
+
+## Completion Reporting
+
+Codex responses must include:
+- ZIP filename
+- ZIP location
+- PR number(s)
+- Merge commit(s)
+- Validation results
+
+## Code Change Reporting
+
+When a ZIP is uploaded, report executable code changes only.
+
+Report format:
+
+```text
+{relative path} — {added|updated|deleted}
+```
+
+Examples:
+
+```text
+toolbox/text-to-speech/index.html — updated
+assets/toolbox/text-to-speech/js/index.js — added
+tests/toolbox/text-to-speech/functional.spec.mjs — updated
+```
+
+Do not report:
+- markdown
+- documentation
+- reports
+- notes
+- README updates
+
+unless explicitly requested.
+
+## No ZIP Means Incomplete
+
+A task is not considered complete until the ZIP artifact is generated and reported.