diff --git a/apps/server/package.json b/apps/server/package.json
index 84a8c6a5988b..9b5f2fb2d7d7 100644
--- a/apps/server/package.json
+++ b/apps/server/package.json
@@ -25,6 +25,7 @@
     "@anthropic-ai/claude-agent-sdk": "^0.3.260",
     "@effect/platform-bun": "catalog:",
     "@effect/platform-node": "catalog:",
+    "@effect/platform-node-shared": "catalog:",
     "@effect/sql-sqlite-bun": "catalog:",
     "@ff-labs/fff-node": "0.9.4",
     "@opencode-ai/sdk": "^1.3.15",
diff --git a/knip.jsonc b/knip.jsonc
index b4510fb6d1e9..859c309ab7c6 100644
--- a/knip.jsonc
+++ b/knip.jsonc
@@ -24,8 +24,9 @@
         "scripts/cli.ts",
         "src/provider/testFixtures/*.mjs",
       ],
+      // Keep the transitive Effect runtime pinned for standalone npm installs.
       // Native msgpack acceleration and the Vite+ web build prerequisite.
-      "ignoreDependencies": ["msgpackr-extract", "@t3tools/web"],
+      "ignoreDependencies": ["@effect/platform-node-shared", "msgpackr-extract", "@t3tools/web"],
     },
     "apps/desktop": {
       // Electron loads these bundles by filename rather than importing them.
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index eb2ff380f6ce..9f175605d8bf 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -501,6 +501,9 @@ importers:
       '@effect/platform-node':
         specifier: 4.0.0-rc.112
         version: 4.0.0-rc.112(bufferutil@4.1.0)(effect@4.0.0-rc.112(patch_hash=8bef799f35729cf3465eb428196f617b434a7c9f658d56acb2874d74b21b98b2))(redis@6.2.1)(utf-8-validate@6.0.6)
+      '@effect/platform-node-shared':
+        specifier: 4.0.0-rc.112
+        version: 4.0.0-rc.112(bufferutil@4.1.0)(effect@4.0.0-rc.112(patch_hash=8bef799f35729cf3465eb428196f617b434a7c9f658d56acb2874d74b21b98b2))(utf-8-validate@6.0.6)
       '@effect/sql-sqlite-bun':
         specifier: 4.0.0-rc.112
         version: 4.0.0-rc.112(effect@4.0.0-rc.112(patch_hash=8bef799f35729cf3465eb428196f617b434a7c9f658d56acb2874d74b21b98b2))