sickn33/antigravity-awesome-skills/claude-in-chrome-troubleshooting

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Diagnose and fix Claude in Chrome MCP extension connectivity issues. Use when mcp__claude-in-chrome__* tools fail, return "Browser extension is not connected", or behave erratically.

Install

npx vskill@latest install sickn33/antigravity-awesome-skills/claude-in-chrome-troubleshooting

SKILL.md

Claude in Chrome MCP Troubleshooting

Use this skill when Claude in Chrome MCP tools fail to connect or work unreliably.

When to Use

  • mcp__claude-in-chrome__* tools fail with "Browser extension is not connected"
  • Browser automation works erratically or times out
  • After updating Claude Code or Claude.app
  • When switching between Claude Code CLI and Claude.app (Cowork)
  • Native host process is running but MCP tools still fail

When NOT to Use

  • Linux or Windows users - This skill covers macOS-specific paths and tools (~/Library/Application Support/, osascript)
  • General Chrome automation issues unrelated to the Claude extension
  • Claude.app desktop issues (not browser-related)
  • Network connectivity problems
  • Chrome extension installation issues (use Chrome Web Store support)

The Claude.app vs Claude Code Conflict (Primary Issue)

Background: When Claude.app added Cowork support (browser automation from the desktop app), it introduced a competing native messaging host that conflicts with Claude Code CLI.

Two Native Hosts, Two Socket Formats
ComponentNative Host BinarySocket Location
Claude.app (Cowork)/Applications/Claude.app/Contents/Helpers/chrome-native-host/tmp/claude-mcp-browser-bridge-$USER/<PID>.sock
Claude Code CLI~/.local/share/claude/versions/<version> --chrome-native-host$TMPDIR/claude-mcp-browser-bridge-$USER (single file)
Why They Conflict
  1. Both register native messaging configs in Chrome:
  • com.anthropic.claude_browser_extension.json → Claude.app helper
  • com.anthropic.claude_code_browser_extension.json → Claude Code wrapper
  1. Chrome extension requests a native host by name
  2. If the wrong config is active, the wrong binary runs
  3. The wrong binary creates sockets in a format/location the MCP client doesn't expect
  4. Result: "Browser extension is not connected" even though everything appears to be running
The Fix: Disable Claude.app's Native Host

If you use Claude Code CLI for browser automation (not Cowork):

bash
# Disable the Claude.app native messaging config
mv ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_browser_extension.json \
~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_browser_extension.json.disabled
# Ensure the Claude Code config exists and points to the wrapper
cat ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_code_browser_extension.json

If you use Cowork (Claude.app) for browser automation:

bash
# Disable the Claude Code native messaging config
mv ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_code_browser_extension.json \
~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_code_browser_extension.json.disabled

These paths and coexistence failures are historical observations, not a universal current-version restriction. Confirm the active host, versions and profile first; use supported reconnect/repair before changing registrations.

Toggle Script

Add this to ~/.zshrc or run directly:

bash
chrome-mcp-toggle() {
local CONFIG_DIR=~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts
local CLAUDE_APP="$CONFIG_DIR/com.anthropic.claude_browser_extension.json"
local CLAUDE_CODE="$CONFIG_DIR/com.anthropic.claude_code_browser_extension.json"
if [[ -f "$CLAUDE_APP" && ! -f "$CLAUDE_APP.disabled" ]]; then
# Currently using Claude.app, switch to Claude Code
mv "$CLAUDE_APP" "$CLAUDE_APP.disabled"
[[ -f "$CLAUDE_CODE.disabled" ]] && mv "$CLAUDE_CODE.disabled" "$CLAUDE_CODE"
echo "Switched to Claude Code CLI"
echo "Restart Chrome and Claude Code to apply"
elif [[ -f "$CLAUDE_CODE" && ! -f "$CLAUDE_CODE.disabled" ]]; then
# Currently using Claude Code, switch to Claude.app
mv "$CLAUDE_CODE" "$CLAUDE_CODE.disabled"
[[ -f "$CLAUDE_APP.disabled" ]] && mv "$CLAUDE_APP.disabled" "$CLAUDE_APP"
echo "Switched to Claude.app (Cowork)"
echo "Restart Chrome to apply"
else
echo "Current state unclear. Check configs:"
ls -la "$CONFIG_DIR"/com.anthropic*.json* 2>/dev/null
fi
}

Usage: chrome-mcp-toggle then restart Chrome (and Claude Code if switching to CLI).

Treat the toggle as an optional local workaround only after confirming the conflict. Back up registrations and refuse destination collisions before any move; the script below is illustrative and does not implement those checks. Closing Chrome can interrupt unrelated work: preserve tabs/forms and obtain authorization before restarting. Diagnostic process arguments/configuration may contain private paths or values; redact before sharing. Do not install the toggle in shell startup without an explicit request.

Quick Diagnosis

bash
# 1. Which native host binary is running?
ps aux | grep chrome-native-host | grep -v grep
# Claude.app: /Applications/Claude.app/Contents/Helpers/chrome-native-host
# Claude Code: ~/.local/share/claude/versions/X.X.X --chrome-native-host
# 2. Where is the socket?
# For Claude Code (single file in TMPDIR):
ls -la "$(getconf DARWIN_USER_TEMP_DIR)/claude-mcp-browser-bridge-$USER" 2>&1
# For Claude.app (directory with PID files):
ls -la /tmp/claude-mcp-browser-bridge-$USER/ 2>&1
# 3. What's the native host connected to?
lsof -U 2>&1 | grep claude-mcp-browser-bridge
# 4. Which configs are active?
ls ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic*.json

Critical Insight

MCP connects at startup. If the browser bridge wasn't ready when Claude Code started, the connection will fail for the entire session. The fix is usually: ensure Chrome + extension are running with correct config, THEN restart Claude Code.

Full Reset Procedure (Claude Code CLI)

bash
# 1. Ensure correct config is active
mv ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_browser_extension.json \
~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_browser_extension.json.disabled 2>/dev/null
# 2. Preserve existing wrapper/configuration and use the installed client's supported repair.
# Do not select an executable by directory modification time or overwrite a working wrapper.
# 3. Inspect exact host PID and socket ownership/path first.
# Stop only the confirmed process for the affected session, with approval.
# Remove only its confirmed stale socket after exit; do not recursively delete bridge directories.
# 4. Restart Chrome
osascript -e 'quit app "Google Chrome"' && sleep 2 && open -a "Google Chrome"
# 5. Wait for Chrome, click Claude extension icon
# 6. Verify correct native host is running
ps aux | grep chrome-native-host | grep -v grep
# Should show: ~/.local/share/claude/versions/X.X.X --chrome-native-host
# 7. Verify socket exists
ls -la "$(getconf DARWIN_USER_TEMP_DIR)/claude-mcp-browser-bridge-$USER"
# 8. Restart Claude Code

Other Common Causes

Multiple Chrome Profiles

If you have the Claude extension installed in multiple Chrome profiles, each spawns its own native host and socket. This can cause confusion.

Fix: Only enable the Claude extension in ONE Chrome profile.

Multiple Claude Code Sessions

Running multiple Claude Code instances can cause socket conflicts.

Fix: Only run one Claude Code session at a time, or use /mcp to reconnect after closing other sessions.

Hardcoded Version in Wrapper

The wrapper at ~/.claude/chrome/chrome-native-host may have a hardcoded version that becomes stale after updates.

Diagnosis:

bash
cat ~/.claude/chrome/chrome-native-host
# Bad: exec "/Users/.../.local/share/claude/versions/2.0.76" --chrome-native-host
# Verify the target is the intended installed version; modification time is not version ordering.

Fix: Use supported client repair to regenerate the wrapper; preserve a backup and verify the intended executable before changing it.

TMPDIR Not Set

Claude Code expects TMPDIR to be set to find the socket.

bash
# Check
echo $TMPDIR
# Should show: /var/folders/XX/.../T/
# Fix: Add to ~/.zshrc
export TMPDIR="${TMPDIR:-$(getconf DARWIN_USER_TEMP_DIR)}"

Diagnostic Deep Dive

bash
echo "=== Native Host Binary ==="
ps aux | grep chrome-native-host | grep -v grep
echo -e "\n=== Socket (Claude Code location) ==="
ls -la "$(getconf DARWIN_USER_TEMP_DIR)/claude-mcp-browser-bridge-$USER" 2>&1
echo -e "\n=== Socket (Claude.app location) ==="
ls -la /tmp/claude-mcp-browser-bridge-$USER/ 2>&1
echo -e "\n=== Native Host Open Files ==="
pgrep -f chrome-native-host | xargs -I {} lsof -p {} 2>/dev/null | grep -E "(sock|claude-mcp)"
echo -e "\n=== Active Native Messaging Configs ==="
ls ~/Library/Application\ Support/Google/Chrome/NativeMessagingHosts/com.anthropic*.json 2>/dev/null
echo -e "\n=== Custom Wrapper Contents ==="
cat ~/.claude/chrome/chrome-native-host 2>/dev/null || echo "No custom wrapper"
echo -e "\n=== TMPDIR ==="
echo "TMPDIR=$TMPDIR"
echo "Expected: $(getconf DARWIN_USER_TEMP_DIR)"

File Reference

FilePurpose
~/.claude/chrome/chrome-native-hostCustom wrapper script for Claude Code
/Applications/Claude.app/Contents/Helpers/chrome-native-hostClaude.app (Cowork) native host
~/.local/share/claude/versions/<version>Claude Code binary (run with --chrome-native-host)
~/Library/Application Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_browser_extension.jsonConfig for Claude.app native host
~/Library/Application Support/Google/Chrome/NativeMessagingHosts/com.anthropic.claude_code_browser_extension.jsonConfig for Claude Code native host
$TMPDIR/claude-mcp-browser-bridge-$USERSocket file (Claude Code)
/tmp/claude-mcp-browser-bridge-$USER/<PID>.sockSocket files (Claude.app)

Summary

  1. Primary issue: Claude.app (Cowork) and Claude Code use different native hosts with incompatible socket formats
  2. Fix: Disable the native messaging config for whichever one you're NOT using
  3. After any fix: Must restart Chrome AND Claude Code (MCP connects at startup)
  4. One profile: Only have Claude extension in one Chrome profile
  5. One session: Only run one Claude Code instance

Original skill by [@jeffzwang](https://github.com/jeffzwang) from [@ExaAILabs](https://github.com/ExaAILabs). Enhanced and updated for current versions of Claude Desktop and Claude Code.

Limitations

  • Use this skill only when the task clearly matches the scope described above.
  • Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
  • Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Security

  • Security scanPassed, 100 of 100Pattern checks on the skill's files.
  • Model reviewPassed

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Source

Popularity

Repository stars
23,153
Repository forks
3,987
Repository npm downloads, 7 days
11,753
7-day trend score
72

Stars and forks are for the whole GitHub repository, not this skill alone. Downloads are for the repository's npm package. Refreshed 17 Mar 2026, 7 months ago.

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