nio-doctor

nio-doctor is a skill for Claude Code from core0-io/nio. It costs 75 tokens per session (653 once invoked), scanned A, original, Apache-2.0.

A Nio configuration and connectivity checker. Nio is a framework that checks whether AI-agent actions and their supporting services are working safely.

In plain words
What is it for?
Use it to validate Nio configuration, test OAuth, language-model, or external scoring connections, and investigate why a scorer is not running.
Why use it?
It can reveal invalid settings or connection problems before they cause silent failures during real tool calls.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: reads .claude/ paths.

Part of the nio plugin — 7 skills, 8 hooks shipped together

Good fit Use it to validate Nio configuration, test OAuth, language-model, or external scoring connections, and investigate why a scorer is not running.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/core0-io/nio/nio-doctor
Install

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.

Any agent
npx skills add core0-io/nio --skill nio-doctor
Clone the repo
git clone --depth 1 https://github.com/core0-io/nio

Made for: Claude Code.

Or install nio, the plugin that ships this one along with the rest of its 7 skills, 8 hooks.

Wrote 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.

agentmods badge for nio-doctor

README.md
[![agentmods](https://agentmods.dev/badge/skills/core0-io/nio/nio-doctor/github.svg)](https://agentmods.dev/skills/core0-io/nio/nio-doctor)
Your own site
<a href="https://agentmods.dev/skills/core0-io/nio/nio-doctor"><img src="https://agentmods.dev/badge/skills/core0-io/nio/nio-doctor/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.

agentmods 80×15 button for nio-doctor

Your own site · 80×15
<a href="https://agentmods.dev/skills/core0-io/nio/nio-doctor"><img src="https://agentmods.dev/badge/skills/core0-io/nio/nio-doctor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 653 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00075 $0.00653
Opus 5 $0.00037 $0.00327
Sonnet 5 $0.00015 $0.00131
Haiku 4.5 $0.00007 $0.00065

Measured 11d ago against content hash 993f4f49ea09, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

nio-doctor 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 11d 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.

plugins/claude-code/skills/nio-doctor/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Nio — Doctor

Validate the current configuration end-to-end. Doctor catches issues before they cause silent failures during real tool calls. This is the focused doctor capability of the Nio framework.

Passive invocation. If the user asks whether their Nio setup/config is valid or working, to test OAuth/LLM/external-endpoint connectivity, or why a scorer isn't firing, you MUST run the CLI below rather than reasoning about it from memory.

Resolving the Script Path

The CLI for this skill lives in the sibling nio skill, not in this skill's own directory:

  1. This SKILL.md's parent directory is THIS skill's directory (e.g. <plugins>/skills/nio-doctor/).
  2. The script is the sibling nio skill's scripts/doctor-cli.js — i.e. ../nio/scripts/doctor-cli.js relative to this directory. Derive the absolute path; do not hard-code ~/.claude/....
  3. Invoke with a single node command — no cd, no ;/&&/|/$(...)/backticks.

Example (substitute the real absolute path):

node /absolute/path/to/skills/nio/scripts/doctor-cli.js

Print its stdout verbatim — it is already formatted markdown.

What Doctor Checks

  1. Configuration — re-runs schema validation against the live ~/.nio/config.yaml, flagging any field with a path + message.
  2. External analysers — fires each enabled guard.external_analyser endpoint (OAuth entries do a real client_credentials grant) and reports ✓ with the returned score or ✗ with the underlying error + a hint: line.
  3. LLM analyser — flags guard.llm_analyser.enabled=true paired with an empty api_key.

Collector reachability is intentionally not probed (OTLP gateways often need routing headers a bare probe wouldn't send). Doctor never writes to the audit log — its probes use a scoped collector discarded after the command returns.

Output Format

A markdown checklist with ✓ / ✗ per check and inline hint: lines, e.g.:

## Nio Doctor

### Configuration
- ✓ ~/.nio/config.yaml loaded successfully

### External Analysers (1 configured)
- ✓ guardrail (https://score.example.com) — score 0.42 [oauth]

Read the full file on GitHub · 56 lines

Changes

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.

  1. 11d ago First seen · 56 lines · 75 tokens per session scan A 993f4f49ea09

Subscribe to this mod's changes

nio-doctor is a skill published in the GitHub repository core0-io/nio (19 stars, last pushed 20d ago), licensed Apache-2.0. It adds 75 tokens to every session and 653 once invoked, about $0.0004 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 2026-08-30.

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