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Agent skill

Healthcheck

by understudy-ai in understudy-ai/understudy

Host security hardening and risk-tolerance guidance for Understudy deployments.

MITAuto-check passedSecurity

Install Healthcheck

skills CLI
$ npx skills add understudy-ai/understudy --skill healthcheck -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install understudy-ai/understudy healthcheck --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/understudy-ai/understudy.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/healthcheck .claude/skills/healthcheck && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
healthcheck
GitHub stars
462
Token cost
~1.2k tokens
SKILL.md length
586 words
Files
1
Skills in repo
4
Repo updated
First seen
Licence
MIT

At a glance

Host security hardening and risk-tolerance guidance for Understudy deployments.

  • Works in 3 steps: Establish context → Run host checks → Run Understudy checks
  • A user asks for security audits
  • SKILL.md covers Overview, Core Rules, Read-Only Workflow and Risk Profiles, plus 7 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Healthcheck is an agent skill from understudy-ai/understudy. Host security hardening and risk-tolerance guidance for Understudy deployments. Use when a user asks for security audits, firewall/SSH/update hardening, exposure review, or recurring checks on a machine running Understudy.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Security, covering Security review and Deployment. The repository describes itself as: An understudy watches. Then performs. The licence is MIT.

When your agent uses it

  • A user asks for security audits
  • Firewall/SSH/update hardening
  • Exposure review
  • Recurring checks on a machine running Understudy

Example prompts

  • “/healthcheck”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Establish context
  2. Run host checks
  3. Run Understudy checks

What it can do on your machine

Read from SKILL.md and the folder at commit 820cac1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Healthcheck loads about 1.2k tokens when it runs. Until then it costs about 59 tokens; SKILL.md has 586 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~59
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from understudy-ai/understudy at commit 820cac1, republished under its MIT licence (© understudy-ai). 586 words, ~1,224 tokens.

Download SKILL.mdSave it as .claude/skills/healthcheck/SKILL.md (or your agent's skills folder).
name
healthcheck
description
Host security hardening and risk-tolerance guidance for Understudy deployments. Use when a user asks for security audits, firewall/SSH/update hardening, exposure review, or recurring checks on a machine running Understudy.

Understudy Host Hardening

Overview

Assess the host that runs Understudy, keep host controls separate from Understudy configuration, and require explicit approval before any change.

Core Rules

  • Start with read-only checks.
  • Require explicit approval before any state-changing action.
  • Do not modify remote access settings until the current access path is confirmed.
  • Prefer reversible changes with a rollback plan.
  • Never claim Understudy itself changes the host firewall, SSH policy, or OS update settings.
  • If identity or role is unclear, provide recommendations only.
  • Present user choices as numbered lists.

Read-Only Workflow

  1. Establish context:
    • OS and version
    • local console vs SSH/RDP/tunnel/tailnet access
    • admin/root availability
    • public exposure, reverse proxy, or private-only reachability
    • backups, disk encryption, and automatic security updates
  2. Run host checks:
    • uname -a, sw_vers, cat /etc/os-release
    • Linux: ss -ltnup, ufw status, firewall-cmd --state, nft list ruleset
    • macOS: lsof -nP -iTCP -sTCP:LISTEN, /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate, pfctl -s info
    • macOS backups: tmutil status
  3. Run Understudy checks:
    • understudy security --audit
    • understudy status --json
    • understudy health --json
    • understudy logs --tail 100
    • understudy doctor --deep when broader local diagnostics are needed

Ask once for permission to run read-only checks. If granted, infer as much as possible from commands before asking follow-up questions.

Risk Profiles

Offer one of these numbered defaults after the host context is known:

  1. Home / workstation balanced
  2. Remote / headless hardened
  3. Developer convenience with explicit exposure warnings
  4. Custom constraints supplied by the user

Remediation Plan

Always present the plan before making changes. Include:

  • target profile
  • current posture summary
  • gaps vs target
  • exact commands to run
  • rollback or access-preservation notes
  • credential and file-permission hygiene notes

Execution Rules

For each state-changing step:

  • show the exact command first
  • explain impact and rollback
  • confirm remote access will remain available
  • stop on unexpected output

Require explicit approval for:

  • firewall changes
  • opening or closing ports
  • SSH or RDP configuration changes
  • package installation or removal
  • enabling or disabling services
  • user or group changes
  • scheduled jobs or persistence
  • access to sensitive files or credentials

Verification

After any change, re-check:

  • firewall status
  • listening ports
  • remote access still works
  • understudy security --audit

Deliver a final posture summary and note any deferred items.

Show full SKILL.md (236 more words)Show less

Periodic Checks

Use Understudy's canonical scheduling surfaces:

  • In agent/runtime workflows: use the schedule tool with actions status, create, list, update, remove, run, runs
  • For explicit manual CLI instructions: use the real understudy schedule command with supported flags such as --status, --list, --add, --update, --remove, --run, and --runs
  • Prefer stable job names:
    • healthcheck:security-audit
    • healthcheck:status-snapshot
  • Before creating or updating, inspect existing jobs with schedule action "list" or understudy schedule --list.
  • Example recurring commands:
    • weekly understudy security --audit
    • daily understudy status --json

Do not create recurring jobs without explicit approval.

Command Accuracy

Use only commands that exist in this repo:

  • understudy security --audit
  • understudy status --json
  • understudy health --json
  • understudy logs --tail 100
  • understudy doctor --deep

Do not invent understudy update status, understudy cron ..., unsupported schedule subcommands, or flags that are not in this repo.

Recordkeeping

If the user wants an audit trail, record:

  • plan ID and timestamp
  • approved steps and exact commands
  • exit codes and files modified (best effort)
  • redacted findings only

Never log tokens or full credential contents.

Memory Writes (Conditional)

Only write to memory files when the user explicitly opts in and the session is private or local. If memory is requested:

  • append dated notes to memory/YYYY-MM-DD.md
  • update MEMORY.md only for durable preferences such as risk posture or allowed ports
  • redact hostnames, IPs, usernames, serials, service names, and secrets

If the session cannot write to the workspace, provide a redacted summary the user can store manually.

© understudy-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/healthcheck of understudy-ai/understudy.

Open the folder on GitHubat commit 820cac1

Compare with similar skills

Healthcheck next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Healthcheck compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Healthcheck this skillunderstudy-ai/understudy462—~1.2kAutomated safety check: PassMIT
Vpn Security CheckSergei-thinker/vpn-setup189—~1.5kAutomated safety check: NotesMIT
Healthchecktrpc-group/trpc-agent-go1.9k9 repos~2.6kAutomated safety check: PassApache-2.0
Security AuditaAAaqwq/AGI-Super-Team1052 repos~619Automated safety check: NotesMIT
Robotics Securityarpitg1304/robotics-agent-skills369—~7.8kAutomated safety check: WarnApache-2.0
Frontmcp Production Readinessagentfront/frontmcp146—~6.5kAutomated safety check: PassApache-2.0

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Categories

Questions about Healthcheck

What does Healthcheck do?

Host security hardening and risk-tolerance guidance for Understudy deployments. Healthcheck is an agent skill from understudy-ai/understudy. Host security hardening and risk-tolerance guidance for Understudy deployments.

When should I use Healthcheck?

Healthcheck fits situations like: A user asks for security audits; firewall/SSH/update hardening; exposure review; recurring checks on a machine running Understudy.

How do I install Healthcheck in Claude Code?

Run `npx skills add understudy-ai/understudy --skill healthcheck -a claude-code`. Or copy the skill folder (skills/healthcheck in understudy-ai/understudy) into .claude/skills/healthcheck in your project. Claude Code loads it when a task matches its description.

How do I install Healthcheck in Codex?

Run `npx skills add understudy-ai/understudy --skill healthcheck -a codex`. Or copy the skill folder (skills/healthcheck in understudy-ai/understudy) into .agents/skills/healthcheck in your project. Codex loads it when a task matches its description.

Can I use Healthcheck in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add understudy-ai/understudy --skill healthcheck -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/healthcheck, .gemini/skills/healthcheck, .github/skills/healthcheck and .opencode/skills/healthcheck in your project.

What does Healthcheck need to run?

SKILL.md names no scripts, command-line tools or credentials: Healthcheck is instructions for the agent only.

Does Healthcheck access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Healthcheck safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Healthcheck use?

Healthcheck is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Healthcheck use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Healthcheck?

Skills that share tags, products or a category with Healthcheck: Vpn Security Check (Sergei-thinker/vpn-setup, 189 stars), Healthcheck (trpc-group/trpc-agent-go, 1.9k stars), Security Audit (aAAaqwq/AGI-Super-Team, 105 stars) and Robotics Security (arpitg1304/robotics-agent-skills, 369 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Healthcheck?

understudy-ai (a GitHub organization) maintains it in understudy-ai/understudy, which has 462 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on June 19, 2026.

Source: understudy-ai/understudy on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.