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Top 5 · 2026-08-30 · source-backed
An r/ClaudeAI PSA (81 upvotes, 49 comments) and a matching X post surfaced something I checked immediately and then fixed on my own machine. cleanupPeriodDays defaults to 30, and the purge runs on every startup. It unlinks .jsonl files under ~/.claude/projects with no warning, no Trash, no grace period. (r/ClaudeAI)
The metadata rows survive the purge. So the sidebar keeps advertising sessions that error with "session not found on disk" when you click them. At least five open issues on anthropics/claude-code track this behavior.
The fix is one line in settings.json:
{ "cleanupPeriodDays": 3650 }
Note the trap: setting it to 0 disables persistence, not cleanup. Reading the name, 0 looks like "never clean up." It means "keep nothing."
Why this matters more than it sounds. A session transcript is the reasoning trace. When an agent makes a decision you don't understand three weeks later, the transcript is the only artifact explaining why. I've gone back to sessions from six weeks prior to figure out why a particular abstraction exists, and on a default install those are gone. Worse, they're gone silently, on a schedule tied to when you happened to launch the binary rather than anything you did.
This lines up with a pattern I noticed across the week's releases. Claude Code 2.1.251 fixed file tools following a symlink swapped inside the working directory after the permission check passed, and Grep and Glob ignoring Read(...) deny rules through a symlinked search path. It also stopped project-level .claude/settings.json from setting CLAUDE_CONFIG_DIR, CLAUDE_CODE_TMPDIR or TMPDIR, and now requires explicit approval for settings that terminate sandbox TLS or inject credential headers. (Claude Code changelog)
The through-line: a checked-out repository was previously trusted to configure the harness reading it. Clone a repo, and its committed settings file could redirect where your session's secrets and scratch files go. That's fixed. But it means the config surface of your agent is security-relevant in ways the docs never framed it as, and the retention default is one more setting nobody read.
Go set cleanupPeriodDays now. It costs you disk and buys you the ability to audit your own past decisions.
Each link below shares sources, entities, or timing with this story.
Claude Code supports Bedrock / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code supports Bedrock); both cover Claude Code, Grep, Worse; cite the same source (Claude Code changelog).
Anthropic released Claude Code / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Claude Code); both cover Claude Code, ClaudeAI, When; reported by the same outlet (reddit.com).
Claude Code supports PowerShell / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code supports PowerShell); both cover Claude Code, Worse; cite the same source (Claude Code changelog).
Anthropic released Claude Code / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Claude Code); both cover Claude Code, ClaudeAI, NOTE; reported by the same outlet (reddit.com).
Linked by a graph relationship (Anthropic released Claude Code); both cover Claude Code, ClaudeAI, When; reported by the same outlet (reddit.com).
Linked by a graph relationship (Anthropic released Claude Code); both cover Claude Code, ClaudeAI, When; reported by the same outlet (reddit.com).
Claude Code uses MCP / Shared entities / Same source / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses MCP); both cover Claude Code, When; cite the same source (Claude Code changelog).
Claude Code supports PowerShell / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code supports PowerShell); both cover Claude Code, Grep; cite the same source (Claude Code changelog).