## Description `/resume` calls `switchSession()` but does not call `invalidateSessionEnvCache()`, so env vars exported via `CLAUDE_ENV_FILE` in `SessionStart` hooks remain stale after switching sessions. ## Environment Info - Platform: linux - Terminal: xterm-256color - Version: 2.1.128 ## Repro **SessionStart hook** (`~/.claude/settings.json`): ```json { "hooks": { "SessionStart": [{ "hooks": [{ "type": "command", "command": "INPUT=$(cat); SID=$(echo \"$INPUT\"

Session environment cache not invalidated on /resume, causing stale env vars

Status Fixed / completed

Reported on v2.1.128

Maintainer reply None cached

Activity 3 comments · opened May 5, 2026 · closed May 7, 2026

Description

/resume calls switchSession() but does not call invalidateSessionEnvCache(), so env vars exported via CLAUDE_ENV_FILE in SessionStart hooks remain stale after switching sessions.

Environment Info

Platform: linux
Terminal: xterm-256color
Version: 2.1.128

Repro

SessionStart hook (~/.claude/settings.json):

{
  "hooks": {
    "SessionStart": [{
      "hooks": [{
        "type": "command",
        "command": "INPUT=$(cat); SID=$(echo \"$INPUT\" | jq -r '.session_id'); if [ -n \"$CLAUDE_ENV_FILE\" ]; then echo \"export CLAUDE_SESSION=$SID\" >> \"$CLAUDE_ENV_FILE\"; fi"
      }]
    }]
  }
}

Steps:

Start claude, run ! echo $CLAUDE_SESSION — prints current session ID
/resume into a different session
! echo $CLAUDE_SESSION — still prints the first session's ID

Root cause

sessionEnvironment.ts caches the sourced env script in a module-level variable. invalidateSessionEnvCache() resets it, but is only called after SessionStart/Setup/CwdChanged hooks — not after switchSession(). So /resume changes the session ID but the cached env script still has the old session's values.

Suggested fix

Call invalidateSessionEnvCache() in switchSession() (bootstrap/state.ts:468).

View original on GitHub ↗

3 Comments

github-actions[bot] · 5 months ago

Found 2 possible duplicate issues:

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mcmanustfj · 5 months ago

This is not a duplicate of either linked issue.

#40391 is about a session ID directory mismatch — hooks write env files to the startup session's directory, but the loader reads from the resumed session's directory. That's a file-path routing problem.

This issue (#56400) is about the in-memory cache in sessionEnvironment.ts not being invalidated when switchSession() runs. Even if #40391 were fixed and env files landed in the correct directory, the cached env script would still serve stale values after /resume because invalidateSessionEnvCache() is never called in that code path.

#51862 is about CLAUDE_ENV_FILE not being auto-sourced by the Bash tool at all on macOS — a different symptom, platform, and root cause.

These are three distinct bugs in the env-file lifecycle: wrong directory (#40391), stale cache (this issue), and missing sourcing (#51862).

github-actions[bot] · 3 months ago

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.