Ensure that PATs work as expected. Make GB_EMAIL validation logic simpler.

Author: royalfig

README.md

@@ -13,7 +13,7 @@ Use the following env variables to configure the MCP server.
 
 | Variable Name | Status   | Description                                                       |
 | ------------- | -------- | ----------------------------------------------------------------- |
-| GB_API_KEY    | Required | A GrowthBook API key.                                             |
+| GB_API_KEY    | Required | A GrowthBook API key or PAT. When using a PAT, MCP server capabilities are limited by its permissions. E.g., if the user can't create an experiment in the app, they also won't be able to create one with the MCP server.                                             |
 | GB_EMAIL      | Required | Your email address used with GrowthBook. Used when creating feature flags and experiments.|
 | GB_API_URL    | Optional | Your GrowthBook API URL. Defaults to `https://api.growthbook.io`. |
 | GB_APP_ORIGIN | Optional | Your GrowthBook app URL Defaults to `https://app.growthbook.io`.  |

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@growthbook/mcp",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "",
   "access": "public",
   "homepage": "https://github.com/growthbook/growthbook-mcp",

src/index.ts

@@ -7,20 +7,24 @@ import { registerExperimentTools } from "./tools/experiments.js";
 import { registerFeatureTools } from "./tools/features.js";
 import { registerProjectTools } from "./tools/projects.js";
 import { registerSdkConnectionTools } from "./tools/sdk-connections.js";
-import { getApiKey, getApiUrl, getAppOrigin, getUser } from "./utils.js";
+import { getApiKey, getApiUrl, getAppOrigin } from "./utils.js";
 import { registerSearchTools } from "./tools/search.js";
 import { registerDefaultsTools } from "./tools/defaults.js";
 
 export const baseApiUrl = getApiUrl();
 export const apiKey = getApiKey();
 export const appOrigin = getAppOrigin();
-export const user = await getUser(baseApiUrl, apiKey);
+export const user = process.env.GB_EMAIL;
+
+if (!user) {
+  throw new Error("GB_EMAIL is not set in the environment variables");
+}
 
 // Create an MCP server
 const server = new McpServer(
   {
     name: "GrowthBook MCP",
-    version: "1.0.0",
+    version: "1.0.2",
   },
   {
     instructions: `You are a helpful assistant that interacts with GrowthBook, an open source feature flagging and experimentation platform. You can create and manage feature flags, experiments (A/B tests), and other resources associated with GrowthBook.

src/tools/experiments.ts

@@ -305,7 +305,7 @@ export function registerExperimentTools({
         name,
         description,
         hypothesis,
-        owner: user.email,
+        owner: user,
         trackingKey: name.toLowerCase().replace(/[^a-z0-9]/g, "-"),
         tags: ["mcp"],
         assignmentQueryId: experimentDefaults?.assignmentQuery,
@@ -335,7 +335,7 @@ export function registerExperimentTools({
 
         const flagPayload = {
           id: flagId,
-          owner: user.name,
+          owner: user,
           defaultValue: variations[0].value,
           valueType:
             typeof variations[0].value === "string"

src/tools/features.ts

@@ -73,7 +73,7 @@ export function registerFeatureTools({
       const payload = {
         id,
         description,
-        owner: user.name,
+        owner: user,
         valueType,
         defaultValue,
         tags: ["mcp"],

src/utils.ts

@@ -11,10 +11,7 @@ export interface BaseToolsInterface {
 
 export interface ExtendedToolsInterface extends BaseToolsInterface {
   appOrigin: string;
-  user: {
-    email: string;
-    name: string;
-  };
+  user: string;
 }
 
 // Shared file extension enum for all MCP tools
@@ -75,58 +72,6 @@ export function getAppOrigin() {
   return `${userAppOrigin || defaultAppOrigin}`;
 }
 
-export async function getUser(baseApiUrl: string, apiKey: string) {
-  const user = process.env.GB_EMAIL || process.env.GB_USER;
-
-  if (!user) {
-    throw new Error("GB_EMAIL environment variable is required");
-  }
-
-  // Show deprecation warning if using the old variable
-  if (process.env.GB_USER && !process.env.GB_EMAIL) {
-    console.error("⚠️  GB_USER is deprecated. Use GB_EMAIL instead.");
-  }
-
-  const emailSchema = z.string().email();
-
-  if (!emailSchema.safeParse(user).success) {
-    throw new Error("GB_EMAIL is not a valid email");
-  }
-
-  try {
-    const users = await fetch(
-      `${baseApiUrl}/api/v1/members?userEmail=${user}`,
-      {
-        headers: {
-          Authorization: `Bearer ${apiKey}`,
-        },
-      }
-    );
-    await handleResNotOk(users);
-
-    const usersData = await users.json();
-
-    if (usersData.members.length === 0) {
-      throw new Error(
-        `Email not found in GrowthBook. Update GB_EMAIL environment variable to your email address in GrowthBook.`
-      );
-    }
-
-    const userFromGrowthBook = {
-      email: usersData.members[0].email,
-      name: usersData.members[0].name,
-    };
-
-    return userFromGrowthBook;
-  } catch (error) {
-    const originalError =
-      error instanceof Error ? error.message : String(error);
-    throw new Error(
-      `Error fetching user from GrowthBook. Please check your GB_EMAIL and GB_API_KEY environment variables. Original error: ${originalError}`
-    );
-  }
-}
-
 export function getDocsMetadata(extension: string) {
   switch (extension) {
     case ".tsx":