Heartbeat

Heartbeat — Scheduled Task Manager

Create, list, pause, and delete recurring background tasks that run Claude on a schedule.

Live LaunchAgent Status

!launchctl list | grep com.aiharness.heartbeat 2>/dev/null || echo "(no heartbeat agents loaded)"

Commands

• /heartbeat create <name> "<prompt>" --interval <minutes> — Create a new scheduled task (interval-based)
• /heartbeat create <name> "<prompt>" --cron "0 8 * * 1-5" — Create a new scheduled task (cron-based)
• /heartbeat list — Show all heartbeat tasks and their status
• /heartbeat pause <name> — Disable a task without deleting it
• /heartbeat resume <name> — Re-enable a paused task
• /heartbeat delete <name> — Remove a task and its plist
• /heartbeat run <name> — Run a task immediately (one-shot, don't wait for schedule)
• /heartbeat logs <name> — Show recent output from a task

How It Works

Each heartbeat task is a macOS LaunchAgent that runs claude -p on a schedule via the Python runner.

launchd (interval timer)
    │
    └── python3 heartbeat-runner.py <task-name>
            │
            ├── Read task config from heartbeat-tasks/<task-name>.json
            ├── Read state from heartbeat-tasks/<task-name>.state.json
            ├── Run: claude -p "<prompt>" --output-format json
            │       (via claude-runner.py with clean env)
            ├── Write result to state file
            ├── Write summary to vault/daily/<date>.md (append)
            └── If notify=discord: send summary to Discord channel

Task Config Format

Each task is defined in heartbeat-tasks/<task-name>.json:

{
  "name": "daily-digest",
  "prompt": "Read all files in vault/learnings/ with today's date...",
  "schedule": "24h",
  "notify": "discord",
  "discord_channel": "general",
  "allowed_tools": ["Read", "Write", "Glob", "Grep"],
  "enabled": true,
  "activeHours": {"start": "07:00", "end": "23:00"}
}

Schedule formats (use ONE):

• "schedule": "30m" — Interval-based (minutes/hours). Maps to launchd StartInterval.
• "cron": "0 8 * * 1-5" — Cron expression (min hour day month weekday). Maps to launchd StartCalendarInterval.

Cron examples:

• "0 8 * * 1-5" — Weekdays at 8:00 AM
• "0 10 * * 0" — Sundays at 10:00 AM
• "30 9 1 * *" — 1st of every month at 9:30 AM
• "0 */6 * * *" — Every 6 hours on the hour

When generating a plist for a cron-based task, convert the cron expression to StartCalendarInterval. For day-of-week ranges like 1-5, create an array of dicts (one per weekday). Cron weekday: 0=Sunday, 1=Monday ... 6=Saturday (matches launchd convention).

activeHours (optional): {"start": "HH:MM", "end": "HH:MM"} — heartbeat-runner skips execution outside this window. Useful for tasks that shouldn't run overnight.

## State Format

Each task maintains state in `heartbeat-tasks/<task-name>.state.json`:

```json
{
  "last_run": "2025-03-10T09:00:00",
  "last_result": "success",
  "last_output_summary": "3 new learnings, 1 pattern approaching promotion",
  "consecutive_failures": 0,
  "total_runs": 42
}

Creating a Heartbeat Task

When the user runs /heartbeat create, do the following:

Step 1: Create Task Config

Write the task JSON to heartbeat-tasks/<name>.json.

Step 2: Create LaunchAgent Plist

Generate a plist at ~/Library/LaunchAgents/com.aiharness.heartbeat.<name>.plist:

<?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.aiharness.heartbeat.<name></string>

    <key>ProgramArguments</key>
    <array>
        <string>/opt/homebrew/bin/python3</string>
        <string>$HOME/.local/ai-harness/heartbeat-tasks/heartbeat-runner.py</string>
        <string><name></string>
    </array>

    <key>WorkingDirectory</key>
    <string>$HOME/.local/ai-harness</string>

    <key>EnvironmentVariables</key>
    <dict>
        <key>PATH</key>
        <string>$HOME/.local/bin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin</string>
        <key>HOME</key>
        <string>$HOME</string>
    </dict>

    <!-- Use ONE of StartInterval OR StartCalendarInterval, not both -->

    <!-- Option A: Interval-based (e.g., every 60 minutes) -->
    <key>StartInterval</key>
    <integer><!-- interval_minutes * 60 --></integer>

    <!-- Option B: Cron-based (e.g., weekdays at 8am) -->
    <!-- Parse cron expression: "minute hour day month weekday" -->
    <!-- Weekday: 0=Sunday, 1=Monday, ..., 6=Saturday -->
    <!--
    <key>StartCalendarInterval</key>
    <dict>
        <key>Hour</key>
        <integer>8</integer>
        <key>Minute</key>
        <integer>0</integer>
        <key>Weekday</key>
        <integer>1</integer>
    </dict>
    -->
    <!-- For multiple schedules (e.g., Mon-Fri), use an array of dicts -->

    <key>RunAtLoad</key>
    <false/>

    <key>StandardOutPath</key>
    <string>$HOME/.local/ai-harness/heartbeat-tasks/logs/<name>.log</string>

    <key>StandardErrorPath</key>
    <string>$HOME/.local/ai-harness/heartbeat-tasks/logs/<name>.log</string>

    <key>ProcessType</key>
    <string>Background</string>
</dict>
</plist>

Important: Use the symlink path (~/.local/ai-harness) not the Desktop path, to avoid TCC issues. When generating the plist, replace $HOME with the user's actual home directory (e.g., /Users/yourusername), since launchd plist files do not expand environment variables.

Step 3: Load the Plist

launchctl load ~/Library/LaunchAgents/com.aiharness.heartbeat.<name>.plist

Pausing / Resuming

• Pause: launchctl unload <plist> and set enabled: false in task config
• Resume: launchctl load <plist> and set enabled: true in task config

Deleting

1. launchctl unload <plist>
2. Delete the plist file
3. Delete the task config and state files
4. Optionally archive logs

Error Handling

• If a task fails 3 consecutive times, auto-pause it and notify via Discord
• Log all failures to the task's state file and log file
• The heartbeat runner should never crash — wrap everything in try/except

Built-in Tasks

These tasks come pre-configured with AI Harness:

daily-digest

• Interval: Once per day (1440 minutes)
• Prompt: Summarize today's vault learnings, check for promotion candidates, list quick-win feature requests
• Output: vault/daily/YYYY-MM-DD.md
• Notify: Discord

session-cleanup

• Interval: Once per day (1440 minutes)
• Prompt: Check bridges/discord/sessions.json for sessions older than 7 days and remove them
• Output: State file only
• Notify: None