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Billy — Cron Guardrails Pack
by
Highlander89
· GitHub ↗
· v0.1.1
382
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Install in OpenClaw
/install billy-cron-guardrails-pack
Description
Lint cron entries for schedule validity, bad model names, and missing NO_REPLY discipline markers.
README (SKILL.md)
cron-guardrails-pack
Author: Billy (SAPCONET)
Purpose
Provide quick lint + checklist guardrails for cron entries and notification discipline (NO_REPLY).
What this skill includes
scripts/cron-lint.py: static checks for cron entry lines.
Checks performed
- Cron schedule must contain exactly 5 fields.
- Rejects known bad model names (for example:
haiku-4-6). - Flags jobs that appear to announce/message but do not include
NO_REPLY.
Usage
Lint a cron file:
python3 scripts/cron-lint.py /path/to/crontab.txt
Lint stdin:
cat /path/to/crontab.txt | python3 scripts/cron-lint.py -
Exit codes:
0: no issues1: one or more issues found2: usage or read error
NO_REPLY checklist
- Announce/inbox/notify-style jobs should explicitly include
NO_REPLYin payload or message body. - Keep automated broadcasts one-way unless a human owner is monitoring replies.
- Include owner and purpose in command comments.
Example cron payload snippet
*/15 * * * * /usr/local/bin/send-inbox --channel ops --tag NO_REPLY --message "NO_REPLY | cron heartbeat"
Usage Guidance
This appears to be a small, local cron linter with no network calls or credential requests — low risk. You can safely inspect the script (it's short and readable) and run it on example crontabs. As with any third-party code, only run it on files you intend to check (it will read any path you pass) and consider running it in a controlled environment before integrating into automated pipelines. Note: there are minor functional quirks (for example NO_REPLY detection is case-sensitive), but these are correctness issues rather than security concerns.
Capability Analysis
Type: OpenClaw Skill
Name: billy-cron-guardrails-pack
Version: 0.1.1
The skill bundle provides a Python script (`scripts/cron-lint.py`) designed to lint cron entries for syntax, disallowed model names, and missing 'NO_REPLY' markers. The `SKILL.md` documentation is purely descriptive and provides usage instructions without any prompt-injection attempts. The Python script reads a specified file path or standard input, performs string-based checks, and prints results to standard output. It does not perform any network operations, file writes, arbitrary command execution, or access sensitive system resources beyond the input file itself. The file reading capability is essential for its stated purpose as a linter, and there is no evidence of intentional harmful behavior or exploitation.
Capability Assessment
Purpose & Capability
Name/description (cron lint, NO_REPLY discipline) match the provided files and requirements. The skill only includes a single Python script and SKILL.md; there are no unrelated env vars, binaries, or external services requested.
Instruction Scope
SKILL.md instructs the agent to run the included script on a crontab file or stdin. The script only reads the supplied path or stdin and performs local static checks (field count, banned model names, presence of NO_REPLY for announce-like commands). It does not access other system paths, environment variables, or external endpoints.
Install Mechanism
No install spec is provided (instruction-only with an included script). Nothing is downloaded or written to disk by an installer; risk from installation is minimal.
Credentials
No credentials, env vars, or config paths are required. The script only processes input you explicitly pass (file or stdin), so requested access is proportionate to the stated task.
Persistence & Privilege
The skill is not always-enabled, does not request persistent presence, and does not modify other skills or system-wide settings.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install billy-cron-guardrails-pack - After installation, invoke the skill by name or use
/billy-cron-guardrails-pack - Provide required inputs per the skill's parameter spec and get structured output
Version History
v0.1.1
Republish: remove pycache artifact + minor doc fixes
v0.1.0
Initial public release.
Metadata
Frequently Asked Questions
What is Billy — Cron Guardrails Pack?
Lint cron entries for schedule validity, bad model names, and missing NO_REPLY discipline markers. It is an AI Agent Skill for Claude Code / OpenClaw, with 382 downloads so far.
How do I install Billy — Cron Guardrails Pack?
Run "/install billy-cron-guardrails-pack" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Billy — Cron Guardrails Pack free?
Yes, Billy — Cron Guardrails Pack is completely free (open-source). You can download, install and use it at no cost.
Which platforms does Billy — Cron Guardrails Pack support?
Billy — Cron Guardrails Pack is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Billy — Cron Guardrails Pack?
It is built and maintained by Highlander89 (@highlander89); the current version is v0.1.1.
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