PatchVault › Errors › Agent Operator Kit (23 skills)

(CRON) info (No MTA installed, discarding output)

cron tried to email your job's stdout/stderr, but there is no mail transfer agent, so the output was thrown away. The job itself may still have run.

Check your code free (runs in your browser)

The box is pre-filled with a sample that triggers this error. Paste your own file to check it. Nothing leaves this page.

Or scan your whole repo locally (free, stdlib Python, read-only):

python3 <(curl -fsSL https://patchvault-81y.pages.dev/starters/agent-config-scan.py) .
Get the Agent Operator Kit (23 skills): $19 one-time

Why it happens

This message is informational. The real problem is that any errors from your job, including an AI agent run, are being lost.

Manual fix

MAILTO=""
*/30 * * * * flock -n /tmp/agent.lock /home/me/run_agent.sh >> /home/me/logs/agent.log 2>&1

Verify

Re-run your install/build and re-scan the file above. The finding should be gone. The paid fixer applies the same change across a repo: --dry-run shows the diff, --apply keeps a .bak of each file, and --rollback restores them.

Sources

Related errors

Full guide and free terminal scanner: Agent Operator Kit (23 skills). Last checked 2026-10-31.