IDE Chat doesn't provide response after selecting Fable 5 for the first time (and accepting required retention policy)

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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

I selected model Fable 5 Extra High to try out the model and to burn up my tokens before my Ultra subscription renews (I was away from work for 3 weeks so I have not used Cursor as much as usual in the last month).

After trying to send the chat prompt (In Cursor IDE), because my privacy setting is Privacy Mode Legacy, I was prompted to accept Anthropic’s data retention policies for using Fable 5, which I did.

And after doing that I didn’t receive a response in chat.

So I don’t know if it received my prompt and used up a bunch of tokens trying to process it, and then just hung, or if there was some other internal error and the prompt was never sent.

Not sure if related, but below is output from Output > Window (note I sent the prompt around 11:30am):

2026-07-28 11:08:57.504 [info] [Window] [UpdateSupervisorGateMirror] Mirrored gate (reason=gate-change, enabled=false)
2026-07-28 11:09:01.943 [info] [Window] Agent URLs changed from server config, updating cursorCreds {"nonPrivacyChanged":true,"newNonPrivacyUrl":"https://agentn.global.api5.cursor.sh","currentNonPrivacyDefault":"https://agentn.api5.cursor.sh"}
2026-07-28 11:09:03.965 [info] [Window] [Cursor Proclist Polling] Started polling (every 5 min)
2026-07-28 11:14:04.498 [info] [Window] [UpdateSupervisorGateMirror] Mirrored gate (reason=gate-change, enabled=false)
2026-07-28 11:19:04.029 [info] [Window] [UpdateSupervisorGateMirror] Mirrored gate (reason=gate-change, enabled=false)
2026-07-28 11:24:03.958 [info] [Window] [UpdateSupervisorGateMirror] Mirrored gate (reason=gate-change, enabled=false)
2026-07-28 11:29:04.484 [info] [Window] [UpdateSupervisorGateMirror] Mirrored gate (reason=gate-change, enabled=false)
2026-07-28 11:30:43.194 [info] [Window] [ComposerWakelockManager] Acquired wakelock id=0 reason="agent-loop" composerId=dd895f9e-***-***-***-***
2026-07-28 11:30:43.194 [info] [Window] [ComposerWakelockManager] Disabled background throttling id=1 reason="agent-loop" composerId=dd895f9e-***-***-***-***
2026-07-28 11:30:45.187 [info] [Window] [buildRequestedModel] composerId=dd895f9e-***-***-***-*** catalogModelId=claude-fable-5 idSource=selectedModels[0] composerModelName=claude-fable-5 selectedModelIds=claude-fable-5 matchingSelectedModel=true maxMode=false resolvedParams=3
2026-07-28 11:30:48.688 [info] [Window] [ComposerWakelockManager] Released wakelock id=0 reason="generation-ended" composerId=dd895f9e-***-***-***-***
2026-07-28 11:30:48.691 [info] [Window] [ComposerWakelockManager] Restored background throttling id=1 reason="generation-ended" composerId=dd895f9e-***-***-***-***
2026-07-28 11:33:20.879 [error] [Window] TreeError [DebugRepl] Tree input not set: Error: TreeError [DebugRepl] Tree input not set
    at jj._updateChildren (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8086:34359)
    at jj.updateChildren (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:8086:34232)
    at mDn.value (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:18870:41030)
    at Pe._deliver (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:55:2962)
    at Pe._deliverQueue (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:55:3053)
    at Pe.fire (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:55:3390)
    at kZe.setVisible (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12876:3684)
    at vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12886:15258
    at Array.map (<anonymous>)
    at EW.setVisible (vscode-file://vscode-app/c:/Users/***/AppData/Local/Programs/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:12886:15249) TreeError [DebugRepl] Tree input not set

Steps to Reproduce

  • Change model to Fable 5 Extra High
  • Send a chat prompt in IDE
  • Accept Anthropic’s retention terms
  • There will be no response to the prompt
  • (After clicking to Edit the prompt, and sending it again, a response is returned as desired)

Expected Behavior

A chat response is received after sending a prompt

Screenshots / Screen Recordings

no_response_to_prompt.png
no_response_to_prompt.png592×517 16.2 KB

Operating System

Windows 10/11

Version Information

Version: 3.13.21 (user setup)
VS Code Extension API: 1.128.0
Commit: 55434bd8062ece6fee083b82beed2aee42d253f0
Date: 2026-07-27T03:26:14.573Z
Layout: IDE
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Windows_NT x64 10.0.26200

For AI issues: which model did you use?

Fable 5 Extra High

Does this stop you from using Cursor

No - Cursor works, but with this issue

6

Hey there!

First, the reassuring part: no tokens were used. When a prompt is stopped at that “Review Data Policy” step, it never reaches the model, so nothing gets processed or billed - the request just halts at the consent check.

What you ran into is a real rough edge on our side. After you click Accept on the Fable 5 data-retention prompt, the consent is saved correctly, but the prompt that triggered the dialog isn’t automatically re-sent - so the chat is left with no response. That’s exactly why resending it (or editing and sending again, as you discovered) works. So for now, just send the prompt once more after accepting and it’ll go through. I’ve reported the “auto-resend after accepting” gap to our team.

For a bit of context, Fable 5 runs under Anthropic’s data-retention terms, which is why that one-time acknowledgment is required before first use - details here: Claude Fable 5. And the TreeError [DebugRepl] line in your log is unrelated Debug-console noise, not connected to this.

Let me know if resending doesn’t work and I’ll dig in further!

7

Thanks for info.

Yes I thought it might be a relatively trivial ‘bug’ to resolve on your end.

Just wanted to document it, so steps were easy to identify etc.

Thanks again.