Claude Code / AI Coding Tools

Claude Desktop settings not UID-namespaced — multi-user macOS hits EACCES crash

Fix Claude Desktop settings file collision causing EACCES crashes in multi-user macOS environments due to missing UID namespacing Includes evidence for Claude Code troubleshooting demand.

Source-backed Last updated May 18, 2026 1 source Needs local verification

Category: AI Coding Tools
Error signature: EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 18, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Claude Code, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user is a Claude Code failure pattern reported for developers trying to fix claude desktop settings file collision causing eacces crashes in multi-user macos environments due to missing uid namespacing. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub Issue #60122 in anthropics/claude-code, opened May 18 2026. Claude Desktop stores shared settings in /tmp without UID namespace, so second macOS user on same machine gets EACCES and the Claude Code IDE panel crashes. Category: AI Coding Tools (desktop/auth area). Multi-user environment pain point.

Common causes

GitHub Issue #60122 in anthropics/claude-code, opened May 18 2026. Claude Desktop stores shared settings in /tmp without UID namespace, so second macOS user on same machine gets EACCES and the Claude Code IDE panel crashes. Category: AI Coding Tools (desktop/auth area). Multi-user environment pain point.

Quick fixes

Confirm the exact error signature matches EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user.
Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user exactly before applying the quick fix.
Compare the failing environment with Claude Code versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user mean in Claude Code?

EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user indicates the workflow described by "Claude Desktop settings not UID-namespaced — multi-user macOS hits EACCES crash" failed in a AI Coding Tools context. Start by confirming the exact signature and the component that emitted it.

What should I check first for EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user?

Check whether this cause matches your environment: GitHub Issue #60122 in anthropics/claude-code, opened May 18 2026. Claude Desktop stores shared settings in /tmp without UID namespace, so second macOS user on same machine gets EACCES and the Claude Code IDE panel crashes. Category: AI Coding Tools (desktop/auth area). Multi-user environment pain point.

Is the EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user guidance source-backed?

The "Claude Desktop settings not UID-namespaced — multi-user macOS hits EACCES crash" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user?

For "Claude Desktop settings not UID-namespaced — multi-user macOS hits EACCES crash", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user?

For "Claude Desktop settings not UID-namespaced — multi-user macOS hits EACCES crash", collect the failing Claude Code command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.