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.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 | $0.00083 | $0.00850 |
| Opus 5 | $0.00042 | $0.00425 |
| Sonnet 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 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.
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.
- 7d 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 (19 stars, last pushed 16d ago), licensed Apache-2.0. It adds 83 tokens to every session and 850 once invoked, about $0.0004 per session on Opus 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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