MCP generate_screen_from_text rejects all credentials — API key and OAuth both fail, management tools work

Stitch
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1

Calling https://stitch.googleapis.com/mcp per the official docs. With a Stitch API key (X-Goog-Api-Key), create_project / list_projects / get_screen all work, but tools/call generate_screen_from_text returns: “Request is missing required authentication credential. Expected OAuth 2 access token, login cookie…”

I then followed the OAuth Setup docs exactly: gcloud installed, gcloud auth login + gcloud auth application-default login, created GCP project, enabled stitch.googleapis.com (state: ENABLED), set quota project, and called with Authorization: Bearer <token> + X-Goog-User-Project. Same tool: create_project succeeds with the Bearer token, generate_screen_from_text still returns the same “missing required authentication credential” error. Sending both credentials together returns “Expected only one form of authentication.” Reproduced identically with a second (personal) account.

Is programmatic generation currently allowlisted? What is required for an account/GCP project to be able to call generate_screen_from_text via MCP?

2

Yes I heva same issue

4

I have the same issue

5

Same issue as mentioned above.

6

The same issue, only the read functions are working.

7

I have the same issue.

8

I solved this problem after configuring OAuth according to this documentation:
https://stitch.withgoogle.com/docs/mcp/setup

9

I have the same problem. I tried with 3 accounts (mine and 2 of my colleagues’ accounts at work). It’s a mass issue.

10

I have the same issue.

11

Guys, Try now the sdk integration is working fine. I think google has fixed it. I just took the code from their docs and created a node file and ran it and it worked.

12

Hey @Mehul_kothari, thanks for confirming! Yes, this issue has been resolved. Requesting everyone in this thread to please test it again on your end and let us know if you encounter any further problems. Thanks!