diff --git a/.changeset/mcp-cli-dynamic-require-shims.md b/.changeset/mcp-cli-dynamic-require-shims.md
new file mode 100644
index 000000000..f73bc8f7f
--- /dev/null
+++ b/.changeset/mcp-cli-dynamic-require-shims.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/ai-mcp': patch
+---
+
+Fix `@tanstack/ai-mcp` CLI crashing on startup with `Error: Dynamic require of "fs" is not supported`. The CLI ships as an ESM bundle with `json-schema-to-typescript` inlined, which uses CJS `require()` internally. Enabling tsup's `shims` option injects a `createRequire(import.meta.url)` shim so those `require()` calls resolve correctly.
diff --git a/packages/ai-mcp/tsup.bin.config.ts b/packages/ai-mcp/tsup.bin.config.ts
index e5635420d..d038360cd 100644
--- a/packages/ai-mcp/tsup.bin.config.ts
+++ b/packages/ai-mcp/tsup.bin.config.ts
@@ -10,5 +10,8 @@ export default defineConfig({
   noExternal: ['json-schema-to-typescript', 'jiti'],
   // Keep the heavy SDK + workspace pkg external (installed alongside).
   external: ['@modelcontextprotocol/sdk', '@tanstack/ai'],
+  // json-schema-to-typescript uses CJS dynamic require(); shims injects
+  // createRequire so those calls work inside this ESM bundle.
+  shims: true,
   banner: { js: '#!/usr/bin/env node' },
 })