diff --git a/.changeset/3198-retrospective-canonical.md b/.changeset/3198-retrospective-canonical.md
new file mode 100644
index 000000000..16b2c39b7
--- /dev/null
+++ b/.changeset/3198-retrospective-canonical.md
@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 3200
+---
+`gsd-health` no longer raises W019 for `RETROSPECTIVE.md` — the file is now registered in `CANONICAL_EXACT` in `artifacts.cjs`, matching its established status as a living artifact produced by `/gsd-complete-milestone`.
diff --git a/get-shit-done/bin/lib/artifacts.cjs b/get-shit-done/bin/lib/artifacts.cjs
index f0eaac96d..f90c0659f 100644
--- a/get-shit-done/bin/lib/artifacts.cjs
+++ b/get-shit-done/bin/lib/artifacts.cjs
@@ -22,6 +22,7 @@ const CANONICAL_EXACT = new Set([
   'THREADS.md',
   'config.json',
   'CLAUDE.md',
+  'RETROSPECTIVE.md',
 ]);
 
 // Pattern-match canonical file names (regex tests on the basename)
diff --git a/get-shit-done/templates/README.md b/get-shit-done/templates/README.md
index 0b9121f2d..f81318043 100644
--- a/get-shit-done/templates/README.md
+++ b/get-shit-done/templates/README.md
@@ -22,6 +22,7 @@ These files live directly at `.planning/` — not inside phase subdirectories.
 | `THREADS.md` | *(inline)* | `/gsd-thread` | Persistent discussion threads |
 | `config.json` | `config.json` | `/gsd-new-project`, `/gsd-health --repair` | Project-specific GSD configuration |
 | `CLAUDE.md` | `claude-md.md` | `/gsd-profile` | Auto-assembled Claude Code context file |
+| `RETROSPECTIVE.md` | *(inline)* | `/gsd-complete-milestone` | Living milestone retrospective updated at each milestone close |
 
 ### Version-stamped artifacts (pattern: `vX.Y-*.md`)
 
diff --git a/tests/enh-2448-artifact-registry.test.cjs b/tests/enh-2448-artifact-registry.test.cjs
index 6c683d2bd..2e98cd989 100644
--- a/tests/enh-2448-artifact-registry.test.cjs
+++ b/tests/enh-2448-artifact-registry.test.cjs
@@ -47,6 +47,10 @@ describe('artifacts.cjs — isCanonicalPlanningFile', () => {
     assert.ok(isCanonicalPlanningFile('v2.3.1-MILESTONE-AUDIT.md'));
   });
 
+  test('returns true for RETROSPECTIVE.md (produced by /gsd-complete-milestone)', () => {
+    assert.strictEqual(isCanonicalPlanningFile('RETROSPECTIVE.md'), true);
+  });
+
   test('returns false for clearly non-canonical names', () => {
     assert.strictEqual(isCanonicalPlanningFile('MY-NOTES.md'), false);
     assert.strictEqual(isCanonicalPlanningFile('scratch.md'), false);