diff --git a/canon/constraints/definition-of-done.md b/canon/constraints/definition-of-done.md
index 49a559c..6c1ca78 100644
--- a/canon/constraints/definition-of-done.md
+++ b/canon/constraints/definition-of-done.md
@@ -47,6 +47,8 @@ This policy is a specific application of the foundational axiom that every claim
 - MUST NOT claim "done" without evidence; the correct response is "This is not complete yet"
 - MUST label partial completion explicitly with what was verified and what remains
 - MUST validate document deliverables against the Writing Canon checklist (`canon/meta/writing-canon.md`) before claiming completion
+- MUST NOT mark a claim as verified without at least one artifact that demonstrates the claimed outcome
+- MUST return `NEEDS_ARTIFACTS` (not `PASS`) when a completion claim exists but the supporting evidence is absent
 
 ---
 
@@ -68,6 +70,7 @@ This policy is a specific application of the foundational axiom that every claim
 - **"I reviewed the code"**: Treating inspection as observation of behavior
 - **"I didn't have time to test"**: Treating explanation as exemption from evidence
 - **"The document exists"**: Treating file creation as completion without validating progressive disclosure structure
+- **"Unverified Completion"**: Accepting a "done" / "finished" / "shipped" claim without corresponding artifacts (screenshots, logs, links, command output). The validation pathway MUST return `NEEDS_ARTIFACTS`, not `PASS`
 
 ---
 
diff --git a/docs/promotions/P0001-completion-requires-artifacts.md b/docs/promotions/P0001-completion-requires-artifacts.md
index d7180dc..4f4cdab 100644
--- a/docs/promotions/P0001-completion-requires-artifacts.md
+++ b/docs/promotions/P0001-completion-requires-artifacts.md
@@ -6,8 +6,8 @@ exposure: nav
 tier: 3
 voice: neutral
 stability: evolving
-tags: ["promotions", "proposed", "validation", "evidence"]
-promotion_status: proposed
+tags: ["promotions", "accepted", "validation", "evidence"]
+promotion_status: accepted
 ---
 
 # P0001: Completion Claims Require Artifacts
@@ -85,16 +85,14 @@ Add to Failure Modes:
 
 ## Status
 
-`proposed`
+`accepted` (2026-05-05)
 
 ## Review Notes
 
-(To be filled during review)
-
-- **Reviewer**:
-- **Decision**:
-- **Date**:
-- **Notes**:
+- **Reviewer**: klappy (operator)
+- **Decision**: `accepted`
+- **Date**: 2026-05-05
+- **Notes**: Oldest backlog item in the `proposed` queue. The Validation Agent (`infra/orchestrator/services/validation.js`) already enforces this at code level via `determineVerdict()` — this canon edit aligns the written constraint with the enforced behavior. Accepted as drafted; execution committed in the same PR appends two MUST bullets to `## Operating Constraints` and one new entry to `## Failure Modes` of `canon/constraints/definition-of-done.md`.
 
 ## Execution Record