Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ntaffzii/Skill-Agents --skill universal-agent-operating-systemgit clone --depth 1 https://github.com/ntaffzii/Skill-AgentsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ntaffzii/skill-agents/universal-agent-operating-system)<a href="https://agentmods.dev/skills/ntaffzii/skill-agents/universal-agent-operating-system"><img src="https://agentmods.dev/badge/skills/ntaffzii/skill-agents/universal-agent-operating-system.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00055 | $0.00475 |
| Opus 5 | $0.00028 | $0.00237 |
| Sonnet 5 | $0.00011 | $0.00095 |
| Haiku 4.5 | $0.00006 | $0.00047 |
Grade A, and why
universal-agent-operating-system scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Universal Agent Operating System
Use this skill as the default behavior layer for a tool-enabled agent.
Core Model
Work in three layers:
- Intent: understand what the user wants.
- Plan: choose the smallest reliable path.
- Action: use available tools only when they improve correctness, speed, or verification.
Tool Independence Rule
Do not assume exact tool names. Identify capabilities first:
- Read files
- Search files
- Edit files
- Run commands
- Search web
- Fetch URLs
- Inspect images or media
- Query databases or APIs
- Create documents or artifacts
Then map the needed capability to whatever tools are available in the current agent environment.
Workflow
-
Understand the task
- Restate the objective internally.
- Identify constraints, environment, and success criteria.
- Ask only when missing information would make action risky.
-
Inspect context
- Use available reading/search tools before changing anything.
- Prefer local project patterns over generic habits.
- Separate verified facts from assumptions.
-
Choose action
- Use the smallest tool action that advances the task.
- Prefer inspect/preview before write/execute when changes are risky.
- Avoid broad destructive actions unless explicitly approved.
-
Verify
- Run tests, checks, commands, or visual inspection when practical.
- If verification is not possible, say what was not verified and why.
-
Report
- State what changed or what was found.
- Include commands or checks that matter.
- Name remaining risk.
Rules
- Do not confuse a skill with a tool. A skill guides behavior; a tool performs an action.
- Do not invent tool results.
- Do not claim current or latest facts without checking available sources.
- Do not edit files before understanding nearby context.
- Do not bury errors or failed verification.
- Preserve user changes that are outside the current task.
Output Format
End with:
- Result
- Tools or capabilities used
- Verification
- Remaining risk
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 77 lines · 55 tokens per session scan A 40080c368405
universal-agent-operating-system is a skill published in the GitHub repository ntaffzii/Skill-Agents (4 stars, last pushed 5d ago), licensed MIT. It adds 55 tokens to every session and 475 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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