claude-rescue 0.2.0

Diagnose and recover corrupted Claude Code session JSONL files

claude-rescue

Diagnose and recover corrupted or fragmented Claude Code session files.

Claude Code stores conversations as JSONL files in ~/.claude/projects/. Over time these files can become fragmented (multiple disconnected conversation chains in one file, usually from interrupted sessions or reconnects) or corrupted (entries referencing parents that don't exist). claude-rescue finds these issues and recovers the best chain so you can resume with full context.

Installation

pipx install claude-rescue   # recommended
# or
pip install claude-rescue

Commands

diagnose

Scan a project directory and report the health of each session file.

claude-rescue diagnose          # current directory (auto-resolved to its Claude project)
claude-rescue diagnose .        # same
claude-rescue diagnose ~/work/my-project
claude-rescue diagnose --subagents   # also show subagent/compaction files

Example output:

(project root)
  Session ID                            Entries   Roots   Broken  Status        Last prompt
  ---------------------------------------------------------------------------------------------------------------
  69e982d2-71f2-447a-a4df-1f90ae590e2d    8682      57        0  ⚠ fragmented  please familiarise yourself with...
  fbf21b51-e264-4721-adf8-d176907d8404    1824       1        0  ✓ healthy     can you add error handling to...

Status meanings:

• ✓ healthy — single chain, no issues
• ⚠ fragmented — multiple disconnected chains; recoverable
• ✗ corrupted — entries with missing parents; recoverable (dangling entries are dropped)

recover

Recover a single session by ID, keeping the most recently written chain.

claude-rescue recover 69e982d2-71f2-447a-a4df-1f90ae590e2d

Output:

Last prompt: please familiarise yourself with this project

Recovered 57 entries (1769 metadata lines) to:
  /home/you/.claude/projects/.../1892d453-aa34-4598-80c0-e214234e0c7d.jsonl

Resume with:
  claude --resume 1892d453-aa34-4598-80c0-e214234e0c7d

Options:

• --pick — interactively choose which chain to recover instead of auto-selecting
• --project PATH — specify the project directory if not auto-detected

Running recover twice on the same session without changes prints the existing ID instead of creating a duplicate.

recover-all

Recover every fragmented or corrupted session in a directory.

claude-rescue recover-all          # current directory
claude-rescue recover-all ~/work/my-project
claude-rescue recover-all --quiet  # suppress per-file resume hints
claude-rescue recover-all --in-place  # overwrite originals (backup as .bak)

Compaction files (agent-acompact-*) are always recovered in-place since they have no session ID to resume.

prune-acompact

Delete compaction sidechain files (agent-acompact-*). These are internal transcripts of Claude's context-summarisation runs and are not needed for resuming sessions — the summary itself is stored inline in the main session file.

claude-rescue prune-acompact            # current directory
claude-rescue prune-acompact --dry-run  # show what would be deleted

On a long-running project this can recover hundreds of MB.

How it works

Claude Code session files are JSONL where each entry has a uuid and optional parentUuid, forming a linked chain. Fragmentation occurs when multiple root entries (entries with no parent) exist in the same file — typically after a reconnect writes a new root instead of continuing from the last entry.

claude-rescue uses a two-pass approach:

1. Pass 1 — extract only uuid/parentUuid via raw-byte regex (no full JSON parse). Builds the chain tree in ~10 MB of memory regardless of file size.
2. Pass 2 — stream the file again, writing only entries belonging to the selected chain.

The best chain is selected by highest last-written line number (most recently active chain). Use --pick to override.

Contributing

Issues and pull requests welcome at github.com/Jwrede/claude-rescue.