Agent View hard-disabled on AWS Bedrock / Vertex / Foundry backends

Summary

Agent View (claude agents, /background, /bg, left-arrow detach) is unavailable in v2.1.139 for any user on a third-party provider backend, even when no disableAgentView setting is present and CLAUDE_CODE_DISABLE_AGENT_VIEW is unset.

The docs at https://code.claude.com/docs/en/agent-view do not mention this restriction — they state only that disableAgentView is the off-switch and that v2.1.139+ is required.

Reproduction

1. Set CLAUDE_CODE_USE_BEDROCK=1 (or CLAUDE_CODE_USE_VERTEX=1, etc.) and configure provider credentials
2. Install Claude Code 2.1.139
3. Run claude agents → returns the static built-in agent definition list, not the tabbed running/blocked/done view
4. Inside an interactive session, /bg and /background both return No commands match

Root cause

In the compiled binary, the Agent View enable-check resolves to:

function DWH(){
  return SH(process.env.CLAUDE_CODE_DISABLE_AGENT_VIEW)
      || vS()?.settings.disableAgentView === true
      || yk1();
}

function yk1(){
  return SH(process.env.CLAUDE_CODE_USE_BEDROCK)
      || SH(process.env.CLAUDE_CODE_USE_VERTEX)
      || SH(process.env.CLAUDE_CODE_USE_FOUNDRY)
      || SH(process.env.CLAUDE_CODE_USE_ANTHROPIC_AWS)
      || SH(process.env.CLAUDE_CODE_USE_MANTLE)
      || A\$() !== null;
}

yk1() returning true forces Agent View off regardless of user/admin settings.

Asks

1. Document the third-party-provider exclusion on the Agent View page so users on Bedrock/Vertex don't waste time debugging.
2. If the gate exists because of dependencies on Anthropic-operated infra (push notification preferences endpoint, etc.), please clarify what's blocking — the daemon itself looks provider-agnostic.
3. Either lift the gate for Bedrock/Vertex or expose an opt-in env var for users willing to live without the Anthropic-only side features.

Environment

• Claude Code: 2.1.139 (macOS arm64, Darwin 24.5.0)
• Backend: AWS Bedrock (CLAUDE_CODE_USE_BEDROCK=1, eu-west-1)
• No disableAgentView set in user, project, or managed settings
• No CLAUDE_CODE_DISABLE_AGENT_VIEW env var