A reliability-first checklist for hardening POSIX-based OpenClaw background workers and unattended automation against shell-specific failures.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install cron-worker-guardrails
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install cron-worker-guardrails using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Cron Worker Guardrails?
Cron Worker Guardrails is a specialized skill designed to eliminate the common pitfalls associated with running unattended scripts in POSIX environments. It provides a robust framework for hardening Openclaw Skills by moving logic away from brittle shell one-liners and into repository-based scripts. This approach ensures that background tasks are resilient to environment drift, quoting errors, and deceptive pipeline failures.
By emphasizing a scripts-first methodology and deterministic execution, this skill helps developers build automation that is both portable and easy to debug. It specifically addresses issues like command substitution surprises and shell-specific exit codes, ensuring that your automation within Openclaw Skills remains silent on success and loud only when it truly matters.
Cron Worker Guardrails Use Cases
- Hardening unattended background tasks against brittle POSIX shell quoting errors.
- Fixing 'works locally, fails in cron' issues caused by environment or working directory drift.
- Managing automated git push rejections on long-lived feature branches without using force-push.
- Preventing false automation failures triggered by SIGPIPE when using pipefail with head.
- Implementing the NO_REPLY convention to minimize notification noise from successful automation runs.
How Cron Worker Guardrails Works
- Migrate complex automation logic into dedicated scripts located within the tools directory of a repository.
- Configure the cron environment to execute a single, short command rather than multi-line shell blocks.
- Enforce a deterministic working directory by explicitly changing to the repository root before script execution.
- Document and standardize environment variables to ensure consistent behavior across different deployment environments.
- Implement silent-on-success patterns by ensuring scripts emit no output or exactly NO_REPLY when execution is successful.
Cron Worker Guardrails Setup
To apply these guardrails to your Openclaw Skills, include the following hardening header at the top of your cron-related prompts:
# Hardening (MUST): follow cron-agent-contract.md (scripts-first, deterministic cwd, silent-on-success).
# Also apply the cron-worker-guardrails skill.
Ensure your cron configuration is simplified to avoid shell escaping issues:
# Example of a hardened cron command
* * * * * cd /path/to/repo && ./tools/background_job.sh
Cron Worker Guardrails Data Schema & Taxonomy
| Element | Standard Pattern | Description |
|---|---|---|
| Script Path | tools/<job>.<ext> |
Logic must reside in the repository to ensure version control and portability. |
| Paths | Repo-relative | Avoid absolute paths; use environment variables or paths relative to the repo root. |
| Success Output | NO_REPLY |
A specific string interpreted by Openclaw Skills as a silent success. |
| Failure Handling | Short alerts | Scripts should emit concise error details to the shell only when a failure occurs. |
Cron Worker Guardrails Advanced Features
- Intelligent git push handling: Automatically transplant commits via cherry-pick on non-fast-forward rejections.
- SIGPIPE mitigation: Safe patterns for using pipefail with head to prevent unnecessary exit code failures.
- Portability enforcement: Strict rules against machine-specific absolute paths to ensure scripts work across different environments.
- Deterministic environment management: Patterns for ensuring PATH and essential variables are correctly inherited within cron shells.
SKILL.md
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