Fix Claude Code Agent Window 403 Error on AWS Bedrock — CLAUDE_CODE_USE_BEDROCK Not Supported in VS Code

What this error means

403 Forbidden — CLAUDE_CODE_USE_BEDROCK=true Agent window is a Claude Code failure pattern reported for developers trying to fix claude code 403 error aws bedrock claude_code_use_bedrock agent window vs code. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Bug report from Windows 11 Enterprise user. CLAUDE_CODE_USE_BEDROCK=true in settings.json. Agent window shows 403. Regular VS Code extension works with same config. Never worked — not a regression.

Common causes

• Setting CLAUDE_CODE_USE_BEDROCK=true causes the VS Code Agent window to fail with 403 Forbidden. The regular editor extension works but Agent window does not. Enterprise users on AWS Bedrock cannot use the Agent feature.
• Bug report from Windows 11 Enterprise user. CLAUDE_CODE_USE_BEDROCK=true in settings.json. Agent window shows 403. Regular VS Code extension works with same config. Never worked — not a regression.

Quick fixes

1. Confirm the exact error signature matches 403 Forbidden — CLAUDE_CODE_USE_BEDROCK=true Agent window.
2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/anthropics/claude-code/issues/59372

Evidence note: Bug report from Windows 11 Enterprise user. CLAUDE_CODE_USE_BEDROCK=true in settings.json. Agent window shows 403. Regular VS Code extension works with same config. Never worked — not a regression.

Related errors

• Claude Code AWS Bedrock configuration
• Claude Code agent view connection failed
• Claude Code Bedrock 403 forbidden

FAQ

What should I check first?

Start with the exact 403 Forbidden — CLAUDE_CODE_USE_BEDROCK=true Agent window text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Claude Code workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without 403 Forbidden — CLAUDE_CODE_USE_BEDROCK=true Agent window.