Session registry file invalid JSON

“The per-process session registry file ~/.claude/sessions/<pid>.json sometimes stops being valid JSON.”

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

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/claude-code/issues/3097/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Session registry file left with stray trailing brace. ~/.claude/sessions/<pid>.json ends with an extra } after a valid object, so standard JSON readers fail to parse it.

Is this your bug?

File my report

Where: Session registry file
Error text: json.decoder.JSONDecodeError: Extra data: line 1 column 549 (char 548)
Versions: 2.1.280
Platforms: macOS
How bad: Breaks a normal workflow.

Not quite your bug?

claude.exe pins one CPU core after watched directory is deleted5 people
Config file reset to empty2 people

Original reports2, newest first

Oct 24, 2026~/.claude/sessions/<pid>.json keeps the previous write's tail after a shorter rewrite (not truncated)#104810
Sep 23, 2026Session registry file gets an extra trailing }, breaks JSON parsing#96438

Session registry file invalid JSON

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

Is this your bug?

Not quite your bug?

Original reports2, newest first

Do you work on Claude Code?