CLI help omits supported X Premium+/SuperGrok subscription linking

[ss251]

Summary

Amp supports linking an X Premium+/SuperGrok subscription, but the CLI help for model providers only advertises the ChatGPT subscription flow. This makes the supported Grok subscription path difficult to discover and can lead users—and agents relying on amp --help—to incorrectly conclude that Amp does not support SuperGrok.

Environment

• Amp CLI: 0.0.1784492094-g5d18e2
• Release date shown by CLI: 2026-07-19
• Platform: macOS arm64

Reproduction

1. Run:

   $ amp config model-providers --help

2. Observe the subscription-related commands:

   add-chatgpt-subscription  Link your ChatGPT subscription to Amp...
   

3. There is no corresponding command or help text for X Premium+/SuperGrok.

4. Link SuperGrok through Amp Settings → Model Providers.

5. Run:

   $ amp config model-providers list

6. The CLI correctly reports the linked provider:

   active  𝕏 Premium+/SuperGrok subscription
   

Expected behavior

The CLI should make the supported SuperGrok flow discoverable. Either:

• add an add-supergrok-subscription (or equivalent) command that starts the xAI OAuth flow, or
• explicitly state in model-providers --help that X Premium+/SuperGrok subscriptions are linked through https://ampcode.com/settings/model-providers.

The Owner's Manual should also list both supported subscription providers consistently.

Actual behavior

The command group says it manages “model provider keys and subscriptions,” but only documents ChatGPT subscription linking. Meanwhile:

• Amp's official Subscriptions, At Last announcement advertises “Use your 𝕏 Premium+/SuperGrok sub.”
• The installed CLI recognizes and lists the 𝕏 Premium+/SuperGrok subscription provider after it is linked through the web UI.

Impact

This inconsistency caused a real support failure: after inspecting the current CLI help and provider list, an Amp agent incorrectly told a user that SuperGrok subscriptions were unsupported. The user had to point the agent to Amp's own documentation before the correct web flow was found.

Suggested acceptance criteria

• amp config model-providers --help documents the supported SuperGrok linking flow.
• If feasible, a CLI command initiates the xAI subscription OAuth flow.
• The Owner's Manual consistently mentions ChatGPT and X Premium+/SuperGrok subscription linking.
• A regression test verifies that all supported subscription provider types have discoverable setup guidance.