the plugin not working on opencode desktop

[kakashi963]

Pre-submission checklist

• I have searched existing issues for duplicates
• I have read the 📋 Troubleshooting Guide
• I have read the README installation instructions

Model used

antigravity-gemini-3-flash

Exact error message

Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API.

Bug description

the plugin was working fine on opencode desktop , but after an update it stoped working , it is still working in cli no problem , but it is not working on desktop version of opencode

Steps to reproduce

Did this ever work?

Worked before, now broken (regression)

Number of Google accounts configured

2-3

Reproducibility

Always (100%)

Plugin version

1.6.5-beta.0

OpenCode version

1.14.33

Operating System

Windows 11

Node.js version

v24.12.0

Environment type

Standard (native terminal)

MCP servers installed

MCP servers installed:

• kapture (currently disabled)
• paper (currently disabled)

Debug logs (REQUIRED)

API key not valid. Please pass a valid API key.
Requested Model: gemini-3-flash-preview
Effective Model: gemini-3-flash
Project: rising-fact-p41fc
Endpoint: https://daily-cloudcode-pa.sandbox.googleapis.com/v1internal:streamGenerateContent?alt=sse
Status: 400
Reproduce the issue
1. Update Opencode Desktop to version 1.14.33.
2. Install opencode-antigravity-auth@beta.
3. Configure google provider with standard model definitions.
4. Try to send a prompt using an Antigravity model.
5. Result: "API key not valid" error persists even with placeholder keys and environment variables set.

Configuration (optional)

{
  "$schema": "https://raw.githubusercontent.com/NoeFabris/opencode-antigravity-auth/main/assets/antigravity.schema.json",
  "debug": true
}

Compliance

• I'm using this plugin for personal development only
• This issue is not related to commercial use or TOS violations

Additional context

The plugin works perfectly fine in the CLI, but fails in the Desktop version after the latest app update. Adding the npm: "@ai-sdk/google" override and a placeholder apiKey in options changed the error from "API key missing" to "API key not valid," but the plugin still fails to intercept and inject the OAuth token in the Desktop environment.

[kakashi963]

this option is missing in the new OpenCode Desktop
v1.14.39

this what only avaible

[kalbaros]

Same ploblem

[stranles]

# OpenCode Desktop + Google Antigravity subscription via `opencode-antigravity-auth`

I managed to get **OpenCode Desktop on Windows** working with Google/Antigravity OAuth models through:

```json
"opencode-antigravity-auth"

The CLI was already working, but Desktop kept failing with:

Google Generative AI API key is missing.
Pass it using the 'apiKey' parameter or the GOOGLE_GENERATIVE_AI_API_KEY environment variable.

Root cause

The problem was not OAuth itself.

OAuth login was successful, and the Windows auth file had a valid google OAuth entry.

The real issue was that OpenCode Desktop found the plugin, but failed to load it because of ESM import resolution:

Directory import ...\dist\src\plugin is not supported resolving ES modules

So the plugin never registered its auth.loader, meaning it never installed the Google provider override:

{
  apiKey: "",
  fetch(...)
}

As a result, Desktop fell back to the native Google provider, which requires:

GOOGLE_GENERATIVE_AI_API_KEY

CLI worked because it resolves/loads the plugin differently.

Fix steps

1. Set the config directory for Desktop

In Windows PowerShell:

setx OPENCODE_CONFIG_DIR "C:\Users\<USER>\AppData\Roaming\OpenCode\config"
setx OPENCODE_ANTIGRAVITY_DEBUG "2"

Then restart PowerShell / Desktop.

2. Run Google OAuth login from Windows

If opencode is not available in PATH, use:

npx.cmd opencode-ai auth login

After login, this file should contain a google OAuth entry:

C:\Users\<USER>\.local\share\opencode\auth.json

Example structure:

"google": {
  "type": "oauth",
  "refresh": "...",
  "access": "...",
  "expires": ...,
  "email": "...",
  "projectId": ""
}

Do not share this file publicly.

3. Use the beta plugin

In:

C:\Users\<USER>\AppData\Roaming\OpenCode\config\opencode.json

change:

"opencode-antigravity-auth@latest"

to:

"opencode-antigravity-auth@beta"

In my case this installed:

opencode-antigravity-auth 1.6.5-beta.0

4. Patch the plugin cache for ESM imports

The beta still had extensionless ESM imports that failed in Desktop/Electron.

Patch this local cache folder:

C:\Users\<USER>\.cache\opencode\packages\opencode-antigravity-auth@beta\node_modules\opencode-antigravity-auth

Make a backup first, for example:

dist.backup-before-esm-patch

The most important manual change was in:

dist\index.js

Change:

export { AntigravityCLIOAuthPlugin, GoogleOAuthPlugin } from "./src/plugin";
export { authorizeAntigravity, exchangeAntigravity } from "./src/antigravity/oauth";

to:

export { AntigravityCLIOAuthPlugin, GoogleOAuthPlugin } from "./src/plugin.js";
export { authorizeAntigravity, exchangeAntigravity } from "./src/antigravity/oauth.js";

I also had to patch:

node_modules\@opencode-ai\plugin\dist\index.js

from:

export * from "./tool";

to:

export * from "./tool.js";

Then I patched the remaining relative imports in dist by adding .js or /index.js where needed.

5. Verify the plugin import

Run:

node --input-type=module -e "import('file:///C:/Users/<USER>/.cache/opencode/packages/opencode-antigravity-auth@beta/node_modules/opencode-antigravity-auth/dist/index.js').then(m=>console.log(Object.keys(m).join(','))).catch(e=>{console.error(e); process.exit(1)})"

Expected output:

AntigravityCLIOAuthPlugin,GoogleOAuthPlugin,authorizeAntigravity,exchangeAntigravity

After this, restart OpenCode Desktop.

Result

After patching, OpenCode Desktop started working with Google/Antigravity OAuth models.

Confirmed working models included:

Gemini 3.1 Pro (Antigravity)
Gemini 3.1 Pro Preview / Gemini CLI

Desktop no longer asked for:

GOOGLE_GENERATIVE_AI_API_KEY

Notes

• This is a local workaround. Plugin or OpenCode updates may overwrite the patched cache.
• Antigravity debug logs on Windows are written here:

C:\Users\<USER>\AppData\Roaming\OpenCode\antigravity-logs

not under:

...\config\antigravity-logs

• Do not share:

  • auth.json
  • antigravity-accounts.json
  • OAuth redirect URLs
  • refresh/access tokens
  • API keys

• This is an unofficial plugin/workaround. Using Antigravity/Gemini subscription this way may violate Google’s ToS, so use at your own risk.