Tool outputs leak across sessions

“Some tool calling results are leaking between sessions.”

Is this your bug? What gets counted gets fixed. Pile on.

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/12264/file
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Tool outputs leak between concurrent sessions in same repo. An edit to a file in one session shows in the other session, including Update(file) and the file edit diff.

Is this your bug?

File my report

Where: CLI sessions
Versions: 2.1.273 to 2.1.296
Platforms: Linux, macOS
How bad: Breaks a normal workflow.

Part of: Bash results show unrelated file diffs3 bugs

Bash diff shows others' edits14 people
Bash-triggered file changes shown as edit diffs in chat5 people

Original reports2, newest first

Oct 13, 2026Concurrent Claude Code sessions in same repo leak tool outputs across sessions#101845
Sep 16, 2026Tool results leaking between sessions in multi-session environments#94765

Tool outputs leak across sessions

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Part of: Bash results show unrelated file diffs3 bugs

Original reports2, newest first

Do you work on Claude Code?