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D0n9X1n edited this page Jul 25, 2026 · 6 revisions

macOS: LaunchAgent

Recommended option: a per-user LaunchAgent. It starts at login, restarts the relay if it dies, and runs as you — so it uses your ~/.copilot-relay token cache rather than a separate one.

One-time setup

npm install -g copilot-relay@latest
copilot-relay auth
which copilot-relay

Note the path which prints. Apple Silicon Homebrew installs to /opt/homebrew/bin, Intel to /usr/local/bin, and nvm to a versioned path under ~/.nvm. The plist needs that absolute path.

Create the plist

Create ~/Library/LaunchAgents/com.d0n9x1n.copilot-relay.plist, replacing the executable path and YOUR_USER:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.d0n9x1n.copilot-relay</string>
  <key>ProgramArguments</key>
  <array>
    <string>/opt/homebrew/bin/copilot-relay</string>
    <string>start</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>KeepAlive</key>
  <dict>
    <key>SuccessfulExit</key>
    <false/>
  </dict>
  <key>ThrottleInterval</key>
  <integer>30</integer>
  <key>WorkingDirectory</key>
  <string>/Users/YOUR_USER</string>
  <key>EnvironmentVariables</key>
  <dict>
    <key>PATH</key>
    <string>/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
  </dict>
  <key>StandardOutPath</key>
  <string>/Users/YOUR_USER/.copilot-relay/logs/launchd.out.log</string>
  <key>StandardErrorPath</key>
  <string>/Users/YOUR_USER/.copilot-relay/logs/launchd.err.log</string>
</dict>
</plist>

copilot-relay start runs in the foreground and handles SIGTERM, which is what launchd expects. Do not add &, nohup, or any other backgrounding — launchd would see the process exit immediately and restart it forever.

Why KeepAlive is a dict, not true

Two settings here are load-bearing. Getting them wrong gives you a service that looks fine until you reboot.

SuccessfulExit: false restarts the relay only when it exits non-zero. With a bare KeepAlive: true, launchd also restarts after a clean shutdown — so copilot-relay stop appears to do nothing, because launchd starts it again a second later. See Stopping it.

ThrottleInterval: 30 bounds the restart rate. The relay validates upstream Copilot access at startup and exits 1 if that fails. At login Wi-Fi has often not associated yet, so the first attempt legitimately fails. Without a throttle, launchd retries as fast as the process can fail. Thirty seconds comfortably outlasts a network coming up, and the relay starts on its own once it does.

The tradeoff: after a reboot the relay may take a minute or two to come up on a slow network. That is it retrying, not breaking.

Load and start

launchctl bootstrap "gui/$(id -u)" ~/Library/LaunchAgents/com.d0n9x1n.copilot-relay.plist
launchctl enable "gui/$(id -u)/com.d0n9x1n.copilot-relay"
launchctl kickstart -k "gui/$(id -u)/com.d0n9x1n.copilot-relay"

After editing the plist, bootout then bootstrap again. kickstart restarts the job but does not reload the file.

Verifying it actually works

Three layers. Each proves strictly more than the one before it, and the first two pass on a relay that cannot serve a single request.

Layer 1 — is the process alive?

launchctl print "gui/$(id -u)/com.d0n9x1n.copilot-relay" | grep -E "state|pid|last exit"
curl -s http://127.0.0.1:4142/healthz

Expect {"ok":true}. This is a static handler: it proves a socket is listening and nothing more. It never contacts GitHub Copilot.

Layer 2 — did config parse and routing resolve?

curl -s http://127.0.0.1:4142/v1/models

Expect your configured models, e.g. gpt-5.6-sol[1m] and claude-opus-5. This is served from config and also never contacts upstream. A relay whose Copilot token expired an hour ago passes layers 1 and 2.

Layer 3 — end to end

curl -s -X POST http://127.0.0.1:4142/v1/messages \
  -H "content-type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{"model":"gpt-5.6-sol","max_tokens":16,
       "messages":[{"role":"user","content":"Reply with the single word: ok"}]}'

A 200 with content and non-zero usage proves the whole path: config, token refresh, the Copilot call, and translation back to Claude shape. This is the only check that proves the relay can serve Claude Code. It costs a handful of tokens.

Layers 1 and 2 passing while layer 3 fails means auth or upstream, not the service registration — run copilot-relay auth and read today's log.

Watching the log

tail -f ~/.copilot-relay/logs/copilot-relay.$(date +%F).log

The log rotates daily and the filename carries the local date. To search every retained day, use the glob:

grep -n "Startup preflight failed" ~/.copilot-relay/logs/copilot-relay.*.log

launchd.err.log catches anything written before the relay's own logger starts. Check it when the service will not start at all.

Stopping it

Which command you want depends on whether you want it to stay stopped.

Stop now, let launchd start it again at next login:

launchctl kill SIGTERM "gui/$(id -u)/com.d0n9x1n.copilot-relay"

Stop now and unload the job — it will not come back until you bootstrap it again:

launchctl bootout "gui/$(id -u)" ~/Library/LaunchAgents/com.d0n9x1n.copilot-relay.plist

Restart:

launchctl kickstart -k "gui/$(id -u)/com.d0n9x1n.copilot-relay"

copilot-relay stop and launchd

copilot-relay stop finds and terminates the relay directly. It exits cleanly, so with SuccessfulExit: false launchd leaves it stopped — CLI and supervisor agree.

With a bare KeepAlive: true, launchd restarts it within seconds and the CLI looks like it did nothing. If you are seeing that, your plist is the old one.

To confirm a relay is gone regardless of supervisor:

copilot-relay stop
lsof -nP -iTCP:4142 -sTCP:LISTEN   # should print nothing

Removing it permanently

launchctl bootout "gui/$(id -u)" ~/Library/LaunchAgents/com.d0n9x1n.copilot-relay.plist
rm ~/Library/LaunchAgents/com.d0n9x1n.copilot-relay.plist

Troubleshooting

Will not start, last exit code = 1. Preflight failed: expired auth or no network. Read the tail of today's log, then copilot-relay auth.

Restarts in a loop. Confirm ThrottleInterval is present. A repeating exit code 1 in launchctl print is preflight failing, which is auth or connectivity — not the plist.

Operation not permitted on bootstrap. The plist is usually not owned by you or has wrong permissions. chmod 644 and check ownership.

Relay runs but Claude Code ignores it. Registration is fine; check ANTHROPIC_BASE_URL in ~/.claude/settings.json. With claudeSetup: true the relay manages that itself at start.

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