From b14a4ef2ddf704f6746ae3d4a4d94f038d734f84 Mon Sep 17 00:00:00 2001
From: sekerderya <deryaseker.dev@gmail.com>
Date: Fri, 22 May 2026 13:26:04 +0300
Subject: [PATCH] fix: add @cfworker/json-schema as runtime dependency in
 client package

---
 .changeset/sixty-cooks-bathe.md | 5 +++++
 packages/client/package.json    | 3 ++-
 pnpm-lock.yaml                  | 6 +++---
 3 files changed, 10 insertions(+), 4 deletions(-)
 create mode 100644 .changeset/sixty-cooks-bathe.md

diff --git a/.changeset/sixty-cooks-bathe.md b/.changeset/sixty-cooks-bathe.md
new file mode 100644
index 0000000000..c2194c6d0c
--- /dev/null
+++ b/.changeset/sixty-cooks-bathe.md
@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/client': patch
+---
+
+Add @cfworker/json-schema as a runtime dependency to fix ERR_MODULE_NOT_FOUND
diff --git a/packages/client/package.json b/packages/client/package.json
index 537804b732..acb041c410 100644
--- a/packages/client/package.json
+++ b/packages/client/package.json
@@ -79,6 +79,7 @@
         "client": "tsx scripts/cli.ts client"
     },
     "dependencies": {
+        "@cfworker/json-schema": "^4.0.3",
         "cross-spawn": "catalog:runtimeClientOnly",
         "eventsource": "catalog:runtimeClientOnly",
         "eventsource-parser": "catalog:runtimeClientOnly",
@@ -108,4 +109,4 @@
         "vitest": "catalog:devTools",
         "tsdown": "catalog:devTools"
     }
-}
+}
\ No newline at end of file
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d4fc799822..1847d83a5d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -492,6 +492,9 @@ importers:
 
   packages/client:
     dependencies:
+      '@cfworker/json-schema':
+        specifier: ^4.0.3
+        version: 4.1.1
       cross-spawn:
         specifier: catalog:runtimeClientOnly
         version: 7.0.6
@@ -511,9 +514,6 @@ importers:
         specifier: catalog:runtimeShared
         version: 4.3.6
     devDependencies:
-      '@cfworker/json-schema':
-        specifier: catalog:runtimeShared
-        version: 4.1.1
       '@eslint/js':
         specifier: catalog:devTools
         version: 9.39.4