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cmux exports NODE_OPTIONS=--require=<module> so that every child node restores the caller's original NODE_OPTIONS instead of inheriting cmux's 4GB heap cap. That module was written under $TMPDIR. macOS reaps $TMPDIR files after a few days of no access, but a running session keeps --require pointing at the deleted path, so every child node then exits with MODULE_NOT_FOUND before it runs any user code. Sessions older than the reaper lost their Claude Code hooks, and nothing pointed at cmux as the cause. The module now lives in the CmuxStateDirectory alongside the rest of cmux's per-user state, created 0700 so it can't be the component that leaves the shared state directory world-readable. Both writers now also drop a stale cmux --require they inherit rather than passing it along, so a session that is already broken heals as soon as it relaunches. Recognising "is this module ours" had drifted between the three implementations, so it is now one shared rule that matches the directory by name. The old substring test would have stripped a caller's own preload that merely happened to live under a path containing "/cmux-". Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughClaude’s restore module now uses a configurable persistent state directory with secure permissions. cmux-owned preload and heap-cap options are removed during normalization and launch sanitization. Tests cover path ownership, stale modules, directory failures, caller options, and permissions. ChangesClaude Node Options Handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR makes the restore module durable and removes stale cmux launch options during successful relaunches, but if the replacement module cannot be created, an old preload reference can remain and still prevent Claude’s child Node processes from starting. This bounded availability risk should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant ClaudeWrapper
participant NodeOptionsDirectory
participant ChildProcess
ClaudeWrapper->>NodeOptionsDirectory: create or install restore-node-options.cjs
ClaudeWrapper->>ChildProcess: pass normalized NODE_OPTIONS
ChildProcess-->>ClaudeWrapper: run with caller options only
Suggested reviewers: 🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (14 passed)
Full details: Description checkExplanation The description is detailed, relevant, and documents the problem, implementation, testing, limitations, and behavioral changes. It does not use the repository template headings or include the checklist, review-trigger block, or demo-video field, but these omissions do not prevent the description from being mostly complete. Full details: Docstring CoverageExplanation Docstring coverage is 38.24% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 4 files. (1 skipped: 1 unsupported.) Full details: Cmux Swift Actor IsolationExplanation PASS: The production Swift diff adds only the stateless Full details: Cmux Swift Blocking RuntimeExplanation PASS. The production Swift diff adds state-directory/file handling and NODE_OPTIONS token processing only. It adds no semaphores, blocking waits, sleeps, delayed dispatch, polling, main-queue sync, or manual locks. Existing blocking primitives in CLI/cmux.swift are unchanged. The Swift test changes are test-only and therefore allowed by the check. Full details: Cmux Browser Automation Off-MainExplanation PASS: The PR does not change browser socket automation. The PR diff changes only Claude NODE_OPTIONS restoration in Full details: Cmux Expensive Synchronous LoadExplanation The production Swift diff does not add or move an expensive agent-history load. Full details: Cmux Cache Substitution CorrectnessExplanation PASS — The diff does not replace an authoritative read with a cached or opportunistic value. The Swift and shell changes read the current process Full details: Cmux No Hacky SleepsExplanation PASS. The pull-request diff adds no fixed sleeps, timers, delayed dispatch, polling loops, or wall-clock retry waits in covered production code. The changed shell wrapper performs synchronous path selection, directory creation, module writing, and token filtering. The other runtime change is Swift, which this rule excludes. The Python changes are test-only and therefore allowed. Full details: Cmux Algorithmic ComplexityExplanation The changed production code performs linear scans over Full details: Cmux Swift ConcurrencyExplanation PASS. The Swift diff adds synchronous path, file, and token-processing logic in Full details: Cmux Swift `@Concurrent`Explanation PASS. The Swift diff adds and modifies only synchronous functions and static helpers. Full details: Cmux Swift Package BoundariesExplanation PASS: The reusable NODE_OPTIONS policy is behind the existing
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🧪 Generate unit tests (beta)
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Inline comments:
In
`@Packages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentLaunchEnvironmentPolicy.swift`:
- Around line 75-76: Update the preload ownership check using CmuxStateDirectory
or the exact normalized injection directory, rather than only matching
parentName and stateDirectoryName, so unrelated paths such as vendor/cmux are
rejected. Fail closed and skip injection when the module directory or path is
unusable, and add a regression test confirming an external
restore-node-options.cjs preload and following caller arguments are preserved.
In `@Resources/bin/cmux-claude-wrapper`:
- Around line 892-893: Update the ownership check near the parent/grandparent
directory comparisons to first recognize when parent_dir matches the configured
cmux_node_options_dir, while preserving the existing legacy and canonical name
checks. Add a regression test that launches twice with a custom module directory
and verifies the second launch retains only caller-provided Node options,
without the cmux preload or 4096 heap cap.
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CLI/cmux.swiftPackages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentLaunchEnvironmentPolicy.swiftPackages/macOS/CMUXAgentLaunch/Tests/CMUXAgentLaunchTests/AgentLaunchEnvironmentPolicyTests.swiftResources/bin/cmux-claude-wrappertests/test_claude_wrapper_hooks.pytests/test_cli_claude_teams_env.py
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…hape Review found the shape-based check was wrong in both directions: it claimed a caller's own preload under an unrelated path like /opt/vendor/cmux/node-options (dropping their following --max-old-space-size with it), and it failed to recognise a module in a configured CMUX_NODE_OPTIONS_DIR that matched neither known shape. Shape alone cannot answer this, so ownership is now the directory the process actually writes to. The name and tail checks remain, but only to recognise copies left by an older build or another process, and the state-directory check now matches the whole .local/state/cmux/node-options tail instead of just the last two components. This matters most on the CLI path, which has no early-return guard: a second launch there would otherwise bake the previous launch's preload into the caller's saved original. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Inline comments:
In `@CLI/cmux.swift`:
- Around line 23294-23297: Update isClaudeNodeOptionsRestoreModuleRequire(_:) to
recognize space-separated --require and -r arguments along with the existing
equals forms, ensuring the associated path token is removed by
cleanedNodeOptions(_:) and normalizedNodeOptionsForRestore(_:). Add regression
coverage for both space-separated forms.
In
`@Packages/macOS/CMUXAgentLaunch/Sources/CMUXAgentLaunch/AgentLaunchEnvironmentPolicy.swift`:
- Around line 85-89: Update AgentLaunchEnvironmentPolicy to accept and compare
against the exact cmux-owned directory written by the caller, including the
default state directory, instead of relying on parentName, legacyDirectoryName,
or stateDirectoryTail path-shape heuristics. Preserve the preload when that
trusted directory is unavailable, and add regression coverage for the vendor
suffix path and cmux-prefixed directory false positives affecting
sanitizedNodeOptions.
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The wrapper and the CLI matched only --require=<path>, so a stale cmux module passed as --require <path> or -r <path> survived both the merge and the saved original. A dead preload left in NODE_OPTIONS is exactly the MODULE_NOT_FOUND crash this mechanism exists to prevent, and the space-separated form is a real shape: it is what a captured launch environment carries, as SessionPersistenceTests already documents. Ownership now answers with a token width rather than a boolean, so a space-separated path is consumed along with its flag. The policy already handled both spellings; it now shares this one implementation instead of keeping its own pair of branches, so the three sites cannot drift again. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Inline comments:
In `@Resources/bin/cmux-claude-wrapper`:
- Line 984: Update merge_node_options and normalize_node_options_for_restore to
tokenize quoted NODE_OPTIONS values according to Node’s quoting rules instead of
using read -r -a, ensuring paths containing spaces remain single tokens and
cmux_owned_require_width recognizes the cmux preload. Add a regression test
covering a quoted require path with spaces and verify the reconstructed
NODE_OPTIONS omits the reaped path.
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node consumes surrounding double quotes in NODE_OPTIONS, so an inherited value can carry them around the path. The wrapper matched the raw token, so a dead cmux preload written --require="<path>" kept its trailing quote, failed the file name test, and survived into the reconstructed NODE_OPTIONS — the same MODULE_NOT_FOUND this change exists to prevent. The Swift side already trimmed them; the wrapper now agrees. This needs no spaces in the path to trigger, unlike the quoted-with-spaces case raised in review, which neither writer can produce: both refuse a module path containing whitespace or a quote outright. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Thanks for working on this. #12022 is now fixed on main by #14814, which moves the Claude |
2 participants
What breaks
cmux-claude-wrapperexports, once perclaudelaunch:The preload exists so child
nodeprocesses get the caller's originalNODE_OPTIONSback instead of inheriting the 4GB heap cap.macOS purges files in
$TMPDIR(/var/folders/<hash>/T) that haven't been accessed in ~3 days. A cmux session that outlives that keeps the--requireexported after the file is gone, so every childnodedies at startup:It fails before any user code runs, so nothing points at cmux as the cause. It surfaced for me as
Stop hook errorin Claude Code — the hooks were fine,nodesimply couldn't start. The irony is that the preload whose only job is to clean upNODE_OPTIONSbecomes the thing that breaks every child process.CLI/cmux.swiftwrites the same module to the same$TMPDIRpath for the Claude Teams flow, so it has the identical bug.daemon/remote/.../agent_launch.gouses a randomized per-launch directory and I left it alone — its comment about same-UID tampering in a predictable shared/tmpis a real concern on Linux, whereas macOS$TMPDIRis already a per-user 0700 directory, so the tradeoff genuinely differs there.The change
CmuxStateDirectory(~/.local/state/cmux/node-options) instead of$TMPDIR. Application Support would re-introduce the TCC prompts from macOS "cmux would like to access data from other apps" prompt on agent session start/quit #5146.0700. Worth flagging on its own: whichever component creates~/.local/state/cmuxsets its mode, andcreateDirectorydoes not re-applyattributesto a directory that already exists — so creating it0755here would leaveSocketControlPasswordStore's password sitting in a world-readable directory. It's a first-writer race, so it would not have been reproducible.--requirethey inherit instead of forwarding it, so a session that is already broken heals as soon as it relaunches. That also drops the paired injected--max-old-space-size=4096while preserving a cap the caller chose, matching whatAgentLaunchEnvironmentPolicyalready did.ClaudeNodeOptionsRestoreModule) that the policy and the CLI both call. It matches the directory by name rather than the previouspath.contains("/cmux-")substring, which would strip a caller's ownrestore-node-options.cjsliving under, say,~/Code/cmux-fork/.", skipping injection rather than emitting aNODE_OPTIONSthatnodecannot parse.Tests
mainwith exactly theMODULE_NOT_FOUNDabove, and the recorded childNODE_OPTIONSis empty there — proving no childnodestarted at all.tests/test_cli_claude_teams_env.pyasserted that an unusableTMPDIRmakes the CLI skip injection.TMPDIRno longer decides the location, so that case now breaks the module directory itself. The CLI gained aCMUX_NODE_OPTIONS_DIRoverride so the test can sandbox the path — without it the test writes into the developer's real~/.local/state/cmux, since the CLI resolves the account home rather than$HOME.tests/test_claude_wrapper_hooks.py, the other wrapper/teams CI tests, and 360CMUXAgentLaunchswift tests pass.shellcheckreports the same findings asmain.cmux-clicompiles cleanly.I could not build the full app target in a fresh clone (ghostty submodule), so CI is the first place the whole app compiles.
Disclosure: I'm Claude, an AI agent. I hit this bug while working inside cmux, traced it, and wrote this patch.
I'm Dario the owner of this minion. Let me know if this makes any sense
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Moves the NODE_OPTIONS restore module out of
$TMPDIRinto the cmux state directory so long-lived sessions no longer break when macOS purges temp files. Both the wrapper andCLI/cmux.swiftnow write the module to~/.local/state/cmux/node-optionsand strip stale cmux--requireflags they inherit, so already-broken sessions heal on relaunch.Details
0700permissions to avoid leaving the shared state directory world-readable.--requirepath is now the directory the process writes to, not its path shape, so a caller's own preload is never stripped even when its path resembles a cmux location.NODE_OPTIONS, cmux's injected heap cap is dropped while preserving a cap the caller chose.--requirespelling and trims surrounding quotes, so a stale preload in any form is stripped.CMUX_NODE_OPTIONS_DIRoverride so tests can sandbox the module path.Written for commit b97edfb. Summary will update on new commits.
Summary by CodeRabbit
New Features
Bug Fixes