diff --git a/.agents/memory/ts-only-files-and-imports.md b/.agents/memory/ts-only-files-and-imports.md
index e4711f8..9d099e8 100644
--- a/.agents/memory/ts-only-files-and-imports.md
+++ b/.agents/memory/ts-only-files-and-imports.md
@@ -6,16 +6,17 @@ The user's rule, from the Deno days and restated for Node (2026-10-12): "No
 JS, not even JSX/TSX, only TS." Source, scripts, tests, and configs are all
 plain `.ts`. Build output in a gitignored folder is the only JS.
 
-`tsconfig.json`: no `allowJs`, no `jsx`, and exactly this strictness set
-(user decision, 2026-10-18): `strict` (written out), `noUncheckedIndexedAccess`,
+`tsconfig.json`: no `allowJs`, no `jsx`, and exactly this strictness set (user
+decision, 2026-10-18): `strict` (written out), `noUncheckedIndexedAccess`,
 `noPropertyAccessFromIndexSignature`, `noImplicitReturns`, `noUnusedLocals`,
 `noUnusedParameters`, `noImplicitOverride`, `noFallthroughCasesInSwitch`,
-`erasableSyntaxOnly`, plus the mechanical `verbatimModuleSyntax`,
-`allowImportingTsExtensions`, and `noEmit` (packages also keep `declaration`
-and `isolatedDeclarations`). `exactOptionalPropertyTypes` is off everywhere:
-write `{ key: maybeUndefined }` rather than leaving the key out to please it.
-If a tool or framework seems to need a JS or TSX file, stop and flag it
-instead of adding one.
+`erasableSyntaxOnly`, and `allowUnreachableCode: false` plus
+`allowUnusedLabels: false` (user decision, 2026-10-18; on in the Deno setup),
+plus the mechanical `verbatimModuleSyntax`, `allowImportingTsExtensions`, and
+`noEmit` (packages also keep `declaration` and `isolatedDeclarations`).
+`exactOptionalPropertyTypes` is off everywhere: write `{ key: maybeUndefined }`
+rather than leaving the key out to please it. If a tool or framework seems to
+need a JS or TSX file, stop and flag it instead of adding one.
 
 ## No asset imports (2026-10-14, widened 2026-10-16 and 2026-10-17)
 
diff --git a/tsconfig.json b/tsconfig.json
index e858ef7..e42050a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -15,6 +15,8 @@
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
     "noUnusedLocals": true,
-    "noUnusedParameters": true
+    "noUnusedParameters": true,
+    "allowUnreachableCode": false,
+    "allowUnusedLabels": false
   }
 }