OpenClaw Plugin Injection Broken for Cron Agents: Fix Guide [3.22]

The Bug: What Is Happening

If you upgraded to OpenClaw 3.22 and your scheduled agents suddenly stopped using their configured plugins, you are not alone. GitHub issue #53893 documents a critical bug where background agents — including cron-triggered, scheduled, and webhook-triggered agents — fail to load any plugins during their execution.

The symptom is subtle and easy to miss. Your cron agent runs on schedule, processes messages, and generates responses. But every plugin-dependent action silently fails. If your agent uses a calendar plugin to check availability, it gets no results. If it uses a CRM plugin to log interactions, nothing gets logged. The agent continues running without plugins as if they were never configured.

There are no error messages in the default log output. The agent does not crash or report a failure. It simply operates without plugin capabilities. This makes the bug particularly dangerous because you might not notice it for days or weeks until you realize your scheduled reports are missing data, your automated follow-ups are not using CRM context, or your background agents are making decisions without the tools they need.

Interactive agents — those triggered by a user sending a message through WhatsApp, Telegram, or the web UI — work perfectly. Their plugins load correctly and function as expected. The bug is isolated to agents that start without an active user session.

Who Is Affected

You are affected if all three of these conditions are true:

• You are running OpenClaw version 3.22 (check with docker exec openclaw openclaw --version)
• You have configured cron agents, scheduled agents, or webhook-triggered background agents
• Those agents use one or more plugins (skills installed from ClawHub or custom plugins)

If your deployment only uses interactive agents (responding to user messages), you are not affected. If your background agents do not use any plugins and rely solely on the base model capabilities, you are also not affected.

The bug was introduced in the 3.22 release as part of a refactor to the plugin loading system. The refactor was intended to improve plugin startup performance by loading plugins asynchronously via a sidecar process. The performance improvement works — plugins load 40% faster in 3.22 — but the asynchronous loading introduced a race condition with background agent initialization.

Root Cause: Sidecar Loading Order

OpenClaw 3.22 introduced a plugin sidecar — a separate background process responsible for loading, validating, and managing plugins. Before 3.22, plugins were loaded synchronously during the main startup sequence. Every agent waited for all plugins to load before starting. This was simple and reliable but slow, especially for deployments with many plugins.

The 3.22 refactor moved plugin loading to an asynchronous sidecar process. The main OpenClaw process starts, launches the sidecar, and continues initialization in parallel. Interactive agents do not start until a user sends a message, so by the time a user message arrives, the sidecar has finished loading and plugins are available.

Background agents, however, start on a timer. Cron agents start at their scheduled time. Webhook agents start when they receive an HTTP request. These startup events can occur before the sidecar has finished initializing. When they do, the agent's execution context is created without plugin references because the sidecar has not yet registered them.

The race condition window is typically 2-8 seconds after container startup, depending on the number of installed plugins. If your cron agent is scheduled to run at a time that coincides with a container restart (or if the container just started and a cron trigger fires within the first few seconds), the agent will run without plugins.

For agents with cron schedules that fire minutes or hours after startup, the bug only manifests if the container was recently restarted. But for agents with frequent schedules (every minute, every 5 minutes), the probability of hitting the race condition on at least one execution is high.

How to Diagnose the Issue

If you suspect your background agents are running without plugins, here is how to confirm:

Check the debug logs. Enable debug logging by setting OPENCLAW_LOG_LEVEL=debug in your environment variables and restart. Then trigger your cron agent and check the logs:

docker logs openclaw --tail 200 | grep -i "plugin"

In a healthy execution, you will see lines like:

[DEBUG] Plugin sidecar ready, 12 plugins loaded
[DEBUG] Agent context created with plugins: [calendar, crm, email, ...]

In a broken execution, you will see:

[DEBUG] Agent context created with plugins: []

The empty plugin array confirms the sidecar was not ready when the agent started.

Check plugin function calls. Look for plugin invocations in the agent's conversation log. If the agent is configured to use a plugin but never calls it, and the agent's responses seem to lack information that the plugin would provide, the plugin was not available.

Fix Option 1: Update to 3.23

The cleanest fix is updating to OpenClaw 3.23, which resolves the sidecar loading order. The 3.23 release adds a synchronization barrier that prevents any agent (interactive or background) from starting until the plugin sidecar reports ready.

# Pull the latest image
docker compose pull

# Restart with the new version
docker compose up -d

After updating, verify the fix by checking your debug logs for the synchronization barrier message:

[INFO] Plugin sidecar ready — releasing agent startup barrier
[DEBUG] Cron agent 'daily-report' starting with 12 plugins

The 3.23 update is backward compatible. Your existing configuration, plugins, and data will work without changes. The only behavioral difference is a slightly longer startup time (the 2-8 seconds that was previously asynchronous is now blocking), but this only affects container startup, not ongoing operation.

Fix Option 2: Startup Delay Workaround

If you cannot update to 3.23 (pinned version, custom patches, or waiting for a stable point release), you can work around the bug by adding a startup delay to your cron agent configuration.

Set the following environment variable:

OPENCLAW_CRON_STARTUP_DELAY=5000

This adds a 5-second delay before cron agents begin their first execution after container startup. The delay gives the plugin sidecar enough time to finish loading in most deployments. If you have a large number of plugins (50+), increase the delay to 10000 (10 seconds).

This is a blunt workaround. It delays all background agents by a fixed amount, regardless of whether the sidecar is ready or not. On fast hardware with few plugins, the sidecar may be ready in 1 second, but your agents still wait 5. On slow hardware with many plugins, 5 seconds might not be enough. The 3.23 fix with its synchronization barrier is the proper solution.

Another workaround is to manually restart your cron agents after the container has been running for at least 10 seconds. You can do this by triggering a cron agent restart via the API:

curl -X POST http://localhost:3008/api/agents/restart \
  -H "Authorization: Bearer your-gateway-token" \
  -H "Content-Type: application/json" \
  -d '{"agents": "cron"}'

This re-initializes all cron agents with the current execution context, which by this point includes the fully loaded plugins. You could automate this with a system-level cron job that runs 15 seconds after container startup.

Frequently Asked Questions

Why are my OpenClaw cron agents not loading plugins?

This is a known bug in OpenClaw 3.22 (GitHub #53893). Background and cron agents initialize before the plugin sidecar is ready, so plugins are not injected into their execution context. Interactive agents work fine because they start after the sidecar is fully loaded.

Does the plugin injection bug affect all OpenClaw agents?

No. Only background agents (cron-triggered, scheduled, and webhook-triggered agents that run without an active user session) are affected. Interactive agents triggered by user messages load plugins correctly because they initialize after the sidecar startup sequence completes.

How do I fix OpenClaw plugin injection for cron agents?

Update to OpenClaw 3.23, which fixes the sidecar loading order. If you cannot update, the workaround is to add a startup delay to your cron agent configuration (OPENCLAW_CRON_STARTUP_DELAY=5000) to give the sidecar time to initialize before cron agents start.

What is the OpenClaw plugin sidecar?

The plugin sidecar is a background process that loads, validates, and manages plugins for OpenClaw agents. It runs alongside the main OpenClaw process and injects plugin capabilities into agent execution contexts. In 3.22, the sidecar initialization was not properly synchronized with background agent startup.