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[BUG] Sessions become unresponsive after upgrade to 2.0.60 (suspected background agent blocking) #13188
Description
Preflight Checklist
- I have searched existing issues and this hasn't been reported yet
- This is a single bug report (please file separate reports for different bugs)
- I am using the latest version of Claude Code
What's Wrong?
Platform: Linux (Ubuntu 24.04)
Description: After upgrading to 2.0.60, both resumed and fresh conversations randomly become completely unresponsive. The prompt appears active but accepts no input. No error message is displayed.
Symptoms:
- Prompt silently stops responding to user input
- ESC does not interrupt - prompt remains dead
- Some slash commands still work (/context) but others don't
- User input appears to be queued but not processed
Reproduction Evidence: When I manually logged out of my Anthropic account in a separate terminal session, the stuck session immediately displayed two backlogged prompts with "Invalid API key" errors - proving input was being queued but not processed:
ULTRATHINK Let's test the comment tool more...
⎿ Invalid API key · Please run /login
/end is running…
⎿ Invalid API key · Please run /login
Suspected Cause: The new "background agent support" feature (from 2.0.60 release notes: "Added background agent support. Agents run in the background while you work") may be silently blocking the main input loop while waiting on something. In the above example however the whole conversation was static for at least an hour, until I got the idea to re-log.
Workaround: None found, except to log out of anthropic and back in.
Related but different issues found:
- Claude Code freezes with 100% CPU during multi-agent task JSON serialization #4580 - Agent freeze but with 100% CPU (yours is silent)
- [Bug] Bash tool ignores ENABLE_BACKGROUND_TASKS=false #10210 - Background tasks not notifying properly (closest match, but different symptom)
- [BUG] Claude Code 2.0.28 Complete UI Freeze - ReadFileUtf8 I/O Block (macOS) #10481 - UI freeze on 2.0.28 macOS (different version/platform)
Issue is distinct because:
- Silent freeze (no CPU spike)
- Specifically on 2.0.60 with new background agent feature
- Linux platform
- Input queues but doesn't process (proven by the logout test showing backlogged prompts)
What Should Happen?
Prompt stays responsive. Background work shows visual feedback. No silent blocking.
Error Messages/Logs
Steps to Reproduce
- Upgrade to Claude Code 2.0.60
- Start a session (fresh or resumed - both affected)
- Work normally for a while (issue is intermittent)
- At some point, the prompt stops responding to input
- Try ESC - no effect
- Try typing - no response
- Some slash commands work (/context) but user prompts do not
To prove input is queued (not dropped):
8. In a separate terminal, run: claude logout
9. The stuck session immediately shows backlogged prompts with "Invalid API key" errors
Claude Model
Opus
Is this a regression?
I don't know
Last Working Version
No response
Claude Code Version
2.0.60
Platform
Anthropic API
Operating System
Ubuntu/Debian Linux
Terminal/Shell
Other
Additional Information
No response
Activity
pweisensee commentedon Dec 6, 2025
I started getting the same thing, immediately after getting the update to this version. I also use multiple terminals running claude code at once, so maybe that is a contributing factor? they seem to become unresponsive very quickly, a few messages in sometimes.
I'm on MacOS 15.7.2
leagueupinc commentedon Dec 6, 2025
Experiencing the same here. No sub-agents, but when 1+ Claude Code CLI is established in IDE, all but one silently hang with no resolution but to close and restart chat, but then within minutes all fail but just one.
danlannan777 commentedon Dec 6, 2025
Also running into this since 2.0.60. Was not happening until the upgrade
mostafaibrahim17 commentedon Dec 6, 2025
same thing here
SaitoPhoenix commentedon Dec 6, 2025
Would love to know if this is a bug or intentional
antoineschaller commentedon Dec 6, 2025
Same here, even tried rolling back to 2.0.59 and it does not solve the issue :(
anton-abyzov commentedon Dec 6, 2025
I experience the same problem, I got it in 2.0.57 version too yesterday, it's all the same freezing in 57 & 60!
mehulparmariitr commentedon Dec 6, 2025
I am on
2.0.59, happening for me as well!!mehulparmariitr commentedon Dec 6, 2025
@smconner Is it just unresponsive or the speed is also affected while thinking? For me coding work is going very slow even on Sonnet 4.5.
RonRichman commentedon Dec 6, 2025
Likewise
65 remaining items
JZtesting commentedon Dec 8, 2025
make sure you restart all IDEs fixed it for me.
productdevbook commentedon Dec 8, 2025
2.0.61 macos same problem +3 terminal.
igorkofman commentedon Dec 9, 2025
Is this in VSCode with multiple agent tabs open? If not sounds like a separate issue perhaps / need more info.
thealbertyang commentedon Dec 9, 2025
Yes, it is still working since the update a few days ago. I am able to run multiple terminals with different sessions on a Mac / VSCode.
skinnyandbald commentedon Dec 9, 2025
Still happening for me on
Version: 2.0.62on MacOS in Claude Code.Not only is it unresponsive but it seems to think that our conversation is actually the one happening in another terminal session
weisisheng commentedon Dec 10, 2025
Agreed
ltawfik commentedon Dec 10, 2025
please update to version 2.0.62
weisisheng commentedon Dec 10, 2025
Updated as soon as it was released, and VS code too. I am now getting timeouts on a single terminal window.
***There are way too many folks seeing the same effects to be able to close this issue prematurely.
hackyon-anthropic commentedon Dec 10, 2025
@weisisheng sounds like you're running into a different issue entirely, can you file another bug and post a video/screenshot of it? it's unlikely what you're running into is the same issue.
For those who are still seeing this bug beyond v2.0.62, can you please file a bug and assign it to me? I'll do my best to track them down. It'd would be great to actually get a video or screenshots so we can debug what's wrong, otherwise it's really hard for us to help if the reported issue is generic freezing.
if you are still seeing after update, please make sure you do a FULL VSCode restart. It's not enough to just close the current window and reopen, you need to kill VSCode entirely and restart for it to take effect.
lgsf commentedon Dec 10, 2025
Still happening with me. I deleted the entire claude installation. Only on mac os version 2.0.64
lgsf commentedon Dec 10, 2025
This needs to be reopened. It is not fixed
hackyon-anthropic commentedon Dec 11, 2025
@lgsf you are likely running into another issue, can you file another bug and post a video/screenshot of the issue? Can you also make sure you exit your VSCode entirely and start it again?
github-actions commentedon Dec 19, 2025
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.