Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/core0-io/nionpx agentmods add skills/core0-io/nio/nio-actionWrote 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/core0-io/nio/nio-action)<a href="https://agentmods.dev/skills/core0-io/nio/nio-action"><img src="https://agentmods.dev/badge/skills/core0-io/nio/nio-action/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/core0-io/nio/nio-action"><img src="https://agentmods.dev/badge/skills/core0-io/nio/nio-action.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 3 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00083 | $0.00850 |
| Opus 5.5 | $0.00033 | $0.00340 |
| Sonnet 5.5 | $0.00017 | $0.00170 |
| Haiku 4.5 | $0.00008 | $0.00085 |
Grade A, and why
nio-action scanned grade A with 1 finding 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
description: Nio runtime action safety evaluator. Use when the user asks whether a specific runtime action is safe — e.g. "is it safe to run `<command>`", "should I allow this curl/POST", "evaluate this file write / secr How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nio — Action Safety Evaluation
Evaluate whether a proposed runtime action should be allowed, denied, or require confirmation. This is the focused action capability of the Nio framework. For detailed policies and detector rules, see ACTION-POLICIES.md.
Passive invocation. If the user asks whether some concrete command/request/file-op/secret-access is safe to run, you MUST evaluate it with the CLI below rather than guessing. (For scanning a body of code/files, use
nio-scan; for live endpoint scores, usenio-external-score.)
Resolving the Script Path
The CLI for this skill lives in the sibling nio skill, not in this skill's own directory. Resolve it relative to where you loaded this SKILL.md:
- This SKILL.md's parent directory is THIS skill's directory (e.g.
<plugins>/skills/nio-action/). - The script is the sibling
nioskill'sscripts/action-cli.js— i.e.../nio/scripts/action-cli.jsrelative to this directory. Derive the absolute path; do not hard-code~/.claude/.... - Invoke with a single
nodecommand — nocd, no;/&&/|/$(...)/backticks.
Example (substitute the real absolute path):
node /absolute/path/to/skills/nio/scripts/action-cli.js decide --type exec_command --command "ls"
Supported Action Types
network_request— HTTP/HTTPS requestsexec_command— Shell command executionread_file/write_file— File system operationssecret_access— Environment variable access
Decision Framework
Parse the user's action description and apply the appropriate detector:
Network Requests: Check domain against webhook list and high-risk TLDs, check body for secrets Command Execution: Check against dangerous/sensitive/system/network command lists, detect shell injection Secret Access: Classify secret type and apply priority-based risk levels
Default Policies
| Scenario | Decision |
|---|---|
| Private key exfiltration | DENY (always) |
| API secret exfiltration | CONFIRM |
| Command execution | DENY (default) |
| Untrusted domain | CONFIRM |
| Body contains secret | DENY |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday Changed 0028ba983811
- 1mo ago First seen · 84 lines · 83 tokens per session scan A 075bef149576
nio-action is a skill published in the GitHub repository core0-io/nio (20 stars, last pushed yesterday), licensed Apache-2.0. It adds 83 tokens to every session and 850 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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