diff --git a/package-lock.json b/package-lock.json
index d7de6bfcf..288c2f4cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,6 +21,7 @@
         "@microsoft/api-extractor": "^7.52.9",
         "@modelcontextprotocol/sdk": "^1.25.2",
         "@rollup/plugin-json": "^6.1.0",
+        "@rollup/plugin-node-resolve": "^16.0.3",
         "@types/jasmine": "^5.1.2",
         "@types/node": "^20.9.0",
         "@types/node-fetch": "^2.6.13",
@@ -1422,6 +1423,31 @@
         }
       }
     },
+    "node_modules/@rollup/plugin-node-resolve": {
+      "version": "16.0.3",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-16.0.3.tgz",
+      "integrity": "sha512-lUYM3UBGuM93CnMPG1YocWu7X802BrNF3jW2zny5gQyLQgRFJhV1Sq0Zi74+dh/6NBx1DxFC4b4GXg9wUCG5Qg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@rollup/pluginutils": "^5.0.1",
+        "@types/resolve": "1.20.2",
+        "deepmerge": "^4.2.2",
+        "is-module": "^1.0.0",
+        "resolve": "^1.22.1"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "rollup": "^2.78.0||^3.0.0||^4.0.0"
+      },
+      "peerDependenciesMeta": {
+        "rollup": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@rollup/pluginutils": {
       "version": "5.3.0",
       "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-5.3.0.tgz",
@@ -2050,6 +2076,13 @@
       "integrity": "sha512-37i+OaWTh9qeK4LSHPsyRC7NahnGotNuZvjLSgcPzblpHB3rrCJxAOgI5gCdKm7coonsaX1Of0ILiTcnZjbfxA==",
       "dev": true
     },
+    "node_modules/@types/resolve": {
+      "version": "1.20.2",
+      "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-1.20.2.tgz",
+      "integrity": "sha512-60BCwRFOZCQhDncwQdxxeOEEkbc5dIMccYLwbxsS4TUNeVECQ/pBJ0j09mrHOl/JJvpRPGwO9SvE4nR2Nb/a4Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/retry": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
@@ -3335,6 +3368,16 @@
       "integrity": "sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==",
       "dev": true
     },
+    "node_modules/deepmerge": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.3.1.tgz",
+      "integrity": "sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/default-require-extensions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-3.0.1.tgz",
@@ -5757,6 +5800,13 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/is-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-module/-/is-module-1.0.0.tgz",
+      "integrity": "sha512-51ypPSPCoTEIN9dy5Oy+h4pShgJmPCygKfyRCISBI+JoWT/2oJvK8QPxmwv7b/p239jXrm9M1mlQbyKJ5A152g==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/is-negative-zero": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/is-negative-zero/-/is-negative-zero-2.0.3.tgz",
diff --git a/package.json b/package.json
index afbd342ef..0e2082ed1 100644
--- a/package.json
+++ b/package.json
@@ -120,6 +120,7 @@
     "@microsoft/api-extractor": "^7.52.9",
     "@modelcontextprotocol/sdk": "^1.25.2",
     "@rollup/plugin-json": "^6.1.0",
+    "@rollup/plugin-node-resolve": "^16.0.3",
     "@types/jasmine": "^5.1.2",
     "@types/node": "^20.9.0",
     "@types/node-fetch": "^2.6.13",
diff --git a/rollup.config.mjs b/rollup.config.mjs
index 508de8b7f..e800d38d3 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -1,4 +1,5 @@
 import json from '@rollup/plugin-json';
+import resolve from '@rollup/plugin-node-resolve';
 import {readFileSync} from 'fs';
 import typescript from 'rollup-plugin-typescript2';
 
@@ -37,6 +38,17 @@ const externalDeps = [
   'p-retry',
 ];
 
+// Web builds must not leave bare npm specifiers — browsers cannot resolve them.
+// Bundle `p-retry` into dist/web; keep other externals that are Node-only unused.
+const webExternalDeps = externalDeps.filter((dep) => dep !== 'p-retry');
+const webPlugins = [
+  ...rollupPlugins,
+  resolve({
+    browser: true,
+    preferBuiltins: false,
+  }),
+];
+
 export default [
   // Cross ES module (dist/index.mjs)
   {
@@ -94,8 +106,8 @@ export default [
       format: 'es',
       sourcemap: true,
     },
-    plugins: rollupPlugins,
-    external: externalDeps,
+    plugins: webPlugins,
+    external: webExternalDeps,
   },
 
   // The `tokenizer/node` ES module (dist/tokenizer/node.mjs)