[Bug]: Getting error during cursor runs, `RetriableError: [canceled] http/2 stream closed with error code CANCEL (0x8)`

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

In a long run it eventually gets this error

Expected behavior

Agent keeps running until work is done

Actual behavior

Error: RetriableError: [canceled] http/2 stream closed with error code CANCEL (0x8)

Impact

Blocks work completely

Version or commit

0.0.42 (719a76ca1dbf)

Environment

macOs 26.6.1 (25G76)

Logs or stack traces

ProviderAdapterRequestError: Provider adapter request failed (cursor) for session/prompt: Cursor reported a transport failure.
    at Array.<anonymous> (file:///Applications/T3%20Code%20(Alpha).app/Contents/Resources/app.asar/apps/server/dist/bin.mjs:146304:98)
    at next (<anonymous>)
    at sendTurn (Alpha)
    at sendTurn (definition) (Alpha)
    at processTurnStartRequested (Alpha)
    at processTurnStartRequested (definition) (file:///Applications/T3%20Code%20(Alpha).app/Contents/Resources/app.asar/apps/server/dist/bin.mjs:203752:36)
    at processDomainEvent (file:///Applications/T3%20Code%20(Alpha).app/Contents/Resources/app.asar/apps/server/dist/bin.mjs:204127:46)
    at processDomainEvent (definition) (file:///Applications/T3%20Code%20(Alpha).app/Contents/Resources/app.asar/apps/server/dist/bin.mjs:204076:29) {
  [cause]: Error: Error: RetriableError: [canceled] http/2 stream closed with error code CANCEL (0x8)
      at causePrettyError (file:///Applications/T3%20Code%20(Alpha).app/Contents/Resources/app.asar/apps/server/dist/claudeHistoryWorker-CAn1PawV.mjs:9188:17)
}

Screenshots, recordings, or supporting files

No response

Workaround

No workaround, but starts working for a while again if you continue

The report identifies apps/web and bundled apps/server/dist/bin.mjs, with the failure surfaced from claudeHistoryWorker and sendTurn. Start by reproducing a long cursor run and tracing the provider adapter request around that path. Done means the agent can complete a long run without the HTTP/2 cancellation error.