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Low reported severity

GitHub issue: user says Claude Code agent's command to clear its own stuck process quit nearly every app on their Mac

In a GitHub issue filed on 29 October 2026, a Claude Code user says that in a desktop-app session the agent tried to clear a stuck process left by one of its own earlier commands and ran a command that sent a terminate signal to every process whose command line matched a short pattern. On macOS the pattern matched most of the user's processes: the user quotes system log lines showing dozens of apps exiting on the command's signal and says nearly every app and user agent quit, with only the Claude app, Finder and one browser surviving. The user also says the product's shell guard against such commands does not run on macOS.

AI system
Claude Code (reported)
Occurred
Event date unknown
Reported
29 October 2026
Event location
Unknown
What the AI did
Acted on the person’s behalf
Reported harm
Other Material Harm
Whose AI use
Their own AI use
Setting
Everyday life
Evidence
AI involvement reported · Causal attribution alleged · 1 source
5 claims: 5 reported. 5 open questions
People reported harmed
1 person

AI system as recorded: Claude Code 2.1.309 agent in the Claude desktop app (Code tab) on macOS 26.2, running commands through its Bash tool, as given in the issue (model not stated)

What Happened

The account. The user says that in a Claude Code session in the Claude desktop app, the agent tried to clear a stuck process left by one of its own earlier commands. The Bash tool call it ran sends a terminate signal to every process of the user whose full command line matches a short text pattern. On macOS, the user explains, one of the flags in the call has no effect and the pattern is matched anywhere in a process's command line, so it matched every process whose path contains words such as Applications.

The reported effect. The user quotes macOS log lines from one second later showing dozens of apps and agents exiting on the command's signal, and says nearly every GUI app and user agent quit; the Claude app, Finder and one browser survived. A read-only check afterwards still matched 47 of their 226 processes.

The guard. The user says the product's shell guard against such commands depends on a system folder that does not exist on macOS, so it never runs there, and only refuses patterns matching the Claude process itself, so it would not have covered this case anywhere. They suggest a portable check, a confirmation step for broad patterns, and treating such commands as destructive.

Limits. The account is the user's own. The session date and transcript are not given, no data loss is described, and the vendor had not replied when the issue was read.

Reported harm

The user says a Claude Code agent's command to clear its own stuck process terminated nearly every app and user agent on their Mac (first-person account with quoted tool call and log lines, uncorroborated; no data loss described).

How Harm Occurred

By the user's account, the agent chose a broad pattern-matching kill command to clear one stuck process of its own; on macOS the pattern matched most of the user's processes, and the product's guard against such commands did not run on that platform.

Outcome

Ongoing

An automation bot labelled the issue as a bug, a duplicate, macOS, bash and sandbox within two minutes of filing. No vendor or other reply had been posted when the issue was read on 30 October 2026.

What remains unknown

  • When the session happened; the issue was filed on 29 October 2026 and does not date the event.
  • Whether any unsaved work was lost when the apps quit; the issue does not say.
  • Which model the agent was running.
  • Whether the vendor has confirmed or fixed the guard; the issue had no reply when read, and an automation bot labelled it a duplicate without naming the earlier issue in the timeline.
  • Where the user lives or works.

What the evidence supports

AI involvement: reported. The user describes what the Claude Code agent did in their own desktop-app session: to clear a stuck process from one of its own earlier commands, it ran a Bash tool call that sent a terminate signal to every user process whose command line matched a short pattern. The issue quotes the tool call and macOS log lines showing apps exiting on that command's signal, and connects the mass quit directly to it. The session transcript is not shared and no vendor reply is in the thread.

5 claims: 5 reported. What the statuses mean

Reported The user said that in a Claude Code session in the desktop app, the agent tried to clear a stuck process left by one of its own earlier commands and ran a Bash tool call that sent a terminate signal to every process of the user whose full command line matched a short text pattern.

Causal attribution. User's account, with the tool call quoted; the session transcript is not shared.

  • github.com(opens in new tab) supports · English
    'In a Claude Code session in the desktop app (Code tab), the agent tried to clear a stuck `cat` process from one of its own earlier commands, using this Bash tool call:'; '`-f` matches an unanchored regex against each process's full command line'
Reported The user said that on macOS the pattern matched every process whose path contained common words such as Applications, and that a second later the system log showed dozens of apps and agents exiting on that command's signal.

Causal attribution. User's account; the log excerpt is quoted in the issue.

  • github.com(opens in new tab) supports · English
    'As a result `cat` matched every process whose path contains "Applications", "Application Support", "locationd", and so on. One second later the unified log shows dozens of lines like:'
Reported The user said nearly every GUI app and user agent quit, that only the Claude app, Finder and one browser survived, and that a read-only check afterwards still matched 47 of their 226 processes.

Causal attribution. User's account of the effect; no data loss is described.

  • github.com(opens in new tab) supports · English
    'Nearly every GUI app and user agent quit. The Claude app, Finder and one browser survived. A read-only `pgrep -f 'cat' -U $(id -u) -x` afterwards still matches 47 of the user's 226 processes.'
Reported The user said the product's built-in shell guard against this kind of command does not run on macOS, and that its scope would not have covered this case even where it runs.

Causal attribution. User's technical analysis; not confirmed by the vendor.

  • github.com(opens in new tab) supports · English
    '**It never runs on macOS.** `/proc` doesn't exist there'; 'In this incident that check would have failed to fire too: the damage was to every other user process, not to the CLI.'
Reported The user gave Claude Code 2.1.309 in the Claude desktop app on macOS 26.2 on Apple silicon.

Causal attribution. User's environment details; context only.

  • github.com(opens in new tab) supports · English
    'Claude Code 2.1.309 (Claude desktop app, Code tab)'; 'macOS 26.2 (Darwin 25.2.0), Apple silicon'

Sources

1 source inspected. Sources that repeat one account do not corroborate each other.

How the sources were read, and where the events happened

Read in English on 2026-10-30 through the GitHub API (issue body, labels and timeline; no comments). No translation was needed; the research agent (an AI) read the text directly. All labels were applied by an automation bot. Applies to s1.

Event countries: Unknown. Affected-person countries: Unknown. Court countries: Unknown.

The issue does not say where the user lives or works.

Reviewed for publication 2026-10-30: Published as a core agent-action case: the user says the Claude Code agent, clearing a stuck process of its own, ran a pattern-matching kill command that terminated nearly every app on their Mac, and quotes the tool call and system log. First-person account, low severity; no data loss is reported.

People described

The Claude Code user whose apps and user agents on their Mac were terminated (age and country not stated)

People reported harmed in this case

1 person

1 AI participant · 0 other people harmed

One person counted: the user whose apps were terminated.

Counted once within this case. The same person may appear in other cases. This count does not establish AI causation.

Tags

#first-person#github-issue#coding-agent#ai-agent

Cite this case

Compiled per our published methodology: verification statuses, sourcing standards, and corrections process.

APA

NOPE. (2026). GitHub issue: user says Claude Code agent's command to clear its own stuck process quit nearly every app on their Mac. AI incidents. https://nope.net/incidents/2026-claude-code-agent-process-kill-command-quit-nearly-every-app-on-users-mac-first-person-github-issue

BibTeX

@misc{2026_claude_code_agent_process_kill_command_quit_nearly_every_app_on_users_mac_first_person_github_issue,
  title = {GitHub issue: user says Claude Code agent's command to clear its own stuck process quit nearly every app on their Mac},
  author = {NOPE},
  year = {2026},
  howpublished = {AI incidents},
  url = {https://nope.net/incidents/2026-claude-code-agent-process-kill-command-quit-nearly-every-app-on-users-mac-first-person-github-issue}
}

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