Claude Code VSCode Extension Stuck on Thinking — Session ID Lost on Webview Restore

What this error means

Claude Code webview stuck on 'Thinking' — sessionID discarded on restore (v2.1.141, regression of #35004) is a Claude Code failure pattern reported for developers trying to fix claude code vscode extension showing thinking forever without displaying response. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Regression of #35004 in v2.1.141. Webview-to-extension binding breaks during streaming. Response exists on disk but UI stays on Thinking. Triggered by lifecycle events during streaming.

Common causes

• v2.1.141 regression causes the webview chat panel to get stuck on ‘Thinking’ indicator indefinitely. The response is generated on backend and persisted to disk, but the live UI never receives streaming updates. Users must close and reopen the tab to see responses.
• Regression of #35004 in v2.1.141. Webview-to-extension binding breaks during streaming. Response exists on disk but UI stays on Thinking. Triggered by lifecycle events during streaming.

Quick fixes

1. Confirm the exact error signature matches Claude Code webview stuck on 'Thinking' — sessionID discarded on restore (v2.1.141, regression of #35004).
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/59202

Evidence note: Regression of #35004 in v2.1.141. Webview-to-extension binding breaks during streaming. Response exists on disk but UI stays on Thinking. Triggered by lifecycle events during streaming.

Related errors

• Claude Code VSCode webview not loading
• Claude Code session data lost
• Claude Code streaming stops mid-response

FAQ

What should I check first?

Start with the exact Claude Code webview stuck on 'Thinking' — sessionID discarded on restore (v2.1.141, regression of #35004) 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 Claude Code webview stuck on 'Thinking' — sessionID discarded on restore (v2.1.141, regression of #35004).