diff --git a/.changeset/tidy-cats-shake.md b/.changeset/tidy-cats-shake.md
new file mode 100644
index 0000000000..df5f4d7520
--- /dev/null
+++ b/.changeset/tidy-cats-shake.md
@@ -0,0 +1,5 @@
+---
+"@cloudflare/tanstack-ai": patch
+---
+
+Mark the package as side-effect free so bundlers can tree-shake unused adapters from top-level imports.
diff --git a/packages/tanstack-ai/package.json b/packages/tanstack-ai/package.json
index b68ebba454..5b41897024 100644
--- a/packages/tanstack-ai/package.json
+++ b/packages/tanstack-ai/package.json
@@ -25,6 +25,7 @@
 		"README.md"
 	],
 	"type": "module",
+	"sideEffects": false,
 	"main": "./dist/index.mjs",
 	"types": "./dist/index.d.mts",
 	"exports": {