[BUG]

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

sdk_stream_ended_no_result had_error=true
stream_idle_partial lastChunkAgeMs≈15000 bytesTotal≈660-700
Trigger: webview "Unhandled case: [object Object]"
Correlation: MCP server reconnect events
Repro: long session (300+ messages), heavy markdown output, MCP servers cycling

What Should Happen?

This stop happening so it doesn't interrupt Claude when he is answering my prompt

Error Messages/Logs

2026-05-14 19:47:54.512 [info] From claude: 2026-05-14T18:47:54.513Z [DEBUG] autocompact: tokens=[REDACTED] level=ok effectiveWindow=980000

2026-05-14 19:47:54.527 [info] Received message from webview: {"type":"request","channelId":"kovm739ld7j","requestId":"r50xbv6ozye","request":{"type":"log_event","eventName":"time_to_response","eventData":{"ttrMs":9096}}}
2026-05-14 19:47:54.596 [info] From claude: 2026-05-14T18:47:54.590Z [DEBUG] Dynamic tool loading: found 4 discovered tools in message history

2026-05-14 19:47:54.619 [info] From claude: 2026-05-14T18:47:54.621Z [DEBUG] Dynamic tool loading: 4/83 deferred tools included

2026-05-14 19:47:54.635 [info] From claude: 2026-05-14T18:47:54.636Z [DEBUG] attribution header x-anthropic-billing-header: cc_version=2.1.141.746; cc_entrypoint=claude-vscode; cch=00000;

2026-05-14 19:47:54.639 [info] From claude: 2026-05-14T18:47:54.640Z [DEBUG] [API:request] Creating client, ANTHROPIC_CUSTOM_HEADERS present: false, has Authorization header: false
2026-05-14T18:47:54.640Z [DEBUG] [API:auth] OAuth token check starting

2026-05-14 19:47:54.640 [info] From claude: 2026-05-14T18:47:54.641Z [DEBUG] [API:auth] OAuth token check complete

2026-05-14 19:47:54.662 [info] From claude: 2026-05-14T18:47:54.663Z [DEBUG] [API REQUEST] /v1/messages x-client-request-id=03adcfdc-412d-42f5-9275-868e997a95a3 source=sdk

2026-05-14 19:47:54.718 [info] From claude: 2026-05-14T18:47:54.719Z [DEBUG] FileHistory: Added snapshot for e2e0dc85-44ea-4443-ae46-5e533c3bc9d0, tracking 4 files

2026-05-14 19:47:58.752 [info] From claude: 2026-05-14T18:47:58.753Z [DEBUG] Stream started - received first chunk

2026-05-14 19:48:13.762 [info] From claude: 2026-05-14T18:48:13.763Z [WARN] [Stall] stream_idle_partial lastChunkAgeMs=15016 bytesTotal=662 idleDeadlineMs=300000

2026-05-14 19:48:38.507 [info] Received message from webview: {"type":"request","requestId":"q6io9ztyaj","request":{"type":"update_session_state","sessionId":"94a33f06-15b3-4060-b9c0-98f3889e06a5","state":"idle","title":"Review Notion property pages and markdown files"}}

Steps to Reproduce

Type in a prompt into claude code chat inside VScode

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.141 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_