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claude-code - 💡(How to fix) Fix [Bug] Anthropic API Error: coworkKappa feature flag unavailable blocks Claude Code launch [1 participants]

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anthropics/claude-code#49437•Fetched 2026-04-17 08:41:14
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Root Cause

Bug Description ⏺ The config confirms you've used Cowork before — there's a lastSeenRequireCoworkFullVmSandbox key in your Claude app
config. The issue is a server-side feature flag: "coworkKappa":{"status":"unavailable"} is being returned from
Anthropic's servers right now.

This means something changed on the backend for your account — not a local issue. Things to try:

  1. Quit and relaunch the Claude desktop app — feature flags are fetched fresh on startup and it may just need to
    refresh
  2. Sign out and back in from the Claude app menu — forces a fresh auth and flag fetch
  3. If still broken, contact Anthropic support at https://support.anthropic.com — since it was working before, they can check your account's Cowork entitlement status

The "process exited with code 1" is Claude Code failing to launch because Cowork isn't authorized for your session
right now. This is not fixable locally.

Code Example

[]
RAW_BUFFERClick to expand / collapse

Bug Description ⏺ The config confirms you've used Cowork before — there's a lastSeenRequireCoworkFullVmSandbox key in your Claude app
config. The issue is a server-side feature flag: "coworkKappa":{"status":"unavailable"} is being returned from
Anthropic's servers right now.

This means something changed on the backend for your account — not a local issue. Things to try:

  1. Quit and relaunch the Claude desktop app — feature flags are fetched fresh on startup and it may just need to
    refresh
  2. Sign out and back in from the Claude app menu — forces a fresh auth and flag fetch
  3. If still broken, contact Anthropic support at https://support.anthropic.com — since it was working before, they can check your account's Cowork entitlement status

The "process exited with code 1" is Claude Code failing to launch because Cowork isn't authorized for your session
right now. This is not fixable locally.

Environment Info

  • Platform: darwin
  • Terminal: Apple_Terminal
  • Version: 2.1.111
  • Feedback ID: f528ccad-4576-470b-bd8e-d020334cd9ee

Errors

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extent analysis

TL;DR

The issue is likely due to a server-side feature flag "coworkKappa" being unavailable, and contacting Anthropic support may resolve the Cowork entitlement status for the account.

Guidance

  • Try quitting and relaunching the Claude desktop app to refresh the feature flags.
  • Sign out and back in from the Claude app menu to force a fresh auth and flag fetch.
  • If the issue persists, contact Anthropic support at https://support.anthropic.com to check the account's Cowork entitlement status.
  • The "process exited with code 1" error is likely a result of Cowork not being authorized for the session, which is not fixable locally.

Notes

The issue seems to be related to a server-side configuration or account settings, and resolving it may require assistance from Anthropic support.

Recommendation

Apply workaround: Contact Anthropic support to resolve the Cowork entitlement status for the account, as the issue is not fixable locally and was working before.

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claude-code - 💡(How to fix) Fix [Bug] Anthropic API Error: coworkKappa feature flag unavailable blocks Claude Code launch [1 participants]