nyxid-service-skill-authoring

nyxid-service-skill-authoring is a skill for Claude Code from ChronoAIProject/NyxID. It costs 136 tokens per session (2,572 once invoked), scanned A, original, Apache-2.0.

A guide for finding or writing an agent skill for a NyxID proxy service when the service has no published API description or typed operations. NyxID is a service that lets an agent call other services through a proxy.

In plain words
What is it for?
Use it to search Ornn for an existing service skill or create one from sources that can be checked.
Why use it?
It avoids guessing API paths and operations, which can lead to incorrect or invented requests.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the nyxid plugin — 16 skills, 1 plugin shipped together

Good fit Use it to search Ornn for an existing service skill or create one from sources that can be checked.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/chronoaiproject/nyxid/nyxid-service-skill-authoring
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 ChronoAIProject/NyxID --skill nyxid-service-skill-authoring
Clone the repo
git clone --depth 1 https://github.com/ChronoAIProject/NyxID

Made for: Claude Code.

Or install nyxid, the plugin that ships this one along with the rest of its 16 skills, 1 plugin.

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 nyxid-service-skill-authoring

README.md
[![agentmods](https://agentmods.dev/badge/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring/github.svg)](https://agentmods.dev/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring)
Your own site
<a href="https://agentmods.dev/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring"><img src="https://agentmods.dev/badge/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring/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 nyxid-service-skill-authoring

Your own site · 80×15
<a href="https://agentmods.dev/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring"><img src="https://agentmods.dev/badge/skills/chronoaiproject/nyxid/nyxid-service-skill-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 136 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,572 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 warn 7 Sept 2026
SkillSpector: 2 findings, up to high

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 →

  • high Privilege Escalation · line 43
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium Rogue Agent · line 184
    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.
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 $0.00136 $0.02572
Opus 5 $0.00068 $0.01286
Sonnet 5 $0.00027 $0.00514
Haiku 4.5 $0.00014 $0.00257

Measured 12d ago against content hash 36a54e1edcd1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

nyxid-service-skill-authoring 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 12d 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.

skills/nyxid-service-skill-authoring/SKILL.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NyxID service skill authoring (via Ornn)

You are an agent facing a NyxID proxy service you do not know how to call: the service publishes no OpenAPI spec, nyxid catalog endpoints <slug> returns nothing, and the only tool available is the generic proxy request (path + method + body). Do not guess endpoint paths from training memory — that is how hallucinated calls happen. Follow this flow instead: find an existing skill on Ornn, or author one from a verifiable source.

Prerequisite: the ornn-agent-manual-cli skill (the Ornn API contract). If it is not already in your context or local skills directory, pull it first:

nyxid proxy request ornn-api "/api/v1/skills/ornn-agent-manual-cli/json" \
  --method GET --output json

All Ornn calls below assume that manual is loaded; it defines authentication, response shapes, and error handling.

No shell? Every step works over plain HTTP

Some agent runtimes cannot execute a CLI but can make HTTP requests. Every nyxid command in this skill has a direct REST equivalent against the NyxID API (base URL below is the deployment you authenticate against, e.g. https://nyx-api.chrono-ai.fun):

  • Auth: send Authorization: Bearer <token> on every request — a NyxID agent API key (nyxid_ag_...) or a user access token. Ask the user for a key if you have none; never scrape one from disk.
  • Ornn calls: nyxid proxy request ornn-api "<path>" --method M is exactly M {BASE}/api/v1/proxy/s/ornn-api<path> — same path, same body, same JSON response. This holds for every Ornn endpoint in this skill and in the Ornn manual.
  • Service inventory (nyxid service list): GET {BASE}/api/v1/keys — the authoritative connected-services view.
  • Catalog metadata (nyxid catalog show <slug>): GET {BASE}/api/v1/catalog/{slug}; typed operations (nyxid catalog endpoints <slug>): GET {BASE}/api/v1/catalog/{slug}/endpoints.
  • Mount a spec / set skills (nyxid service update ...): PUT {BASE}/api/v1/keys/{id} with the exact ID returned by the keys inventory and a JSON body — e.g. {"openapi_spec_url": "https://..."} (empty string clears) or {"recommended_skills": ["name"]} (empty list clears). The endpoint document alone can also be updated via PUT {BASE}/api/v1/endpoints/{endpoint_id} with the same fields.
  • Update account-owned routing or identity settings: resolve the exact UserService ID from GET {BASE}/api/v1/keys, then use PUT {BASE}/api/v1/user-services/{user_service_id} — for example, {"forward_access_token": true}. A catalog service ID is a different identity and must never be used here. Read GET {BASE}/api/v1/keys afterward and verify the same UserService ID. Platform-wide catalog recovery is the separate admin-only POST {BASE}/api/v1/services/{catalog_service_id}/resync-identity API.
  • Call the target service through the proxy (nyxid proxy request <slug> ...): M {BASE}/api/v1/proxy/s/{slug}/<path> — NyxID injects the stored credential; never send the downstream credential yourself.

Read the full file on GitHub · 213 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. 12d ago First seen · 213 lines · 136 tokens per session scan A 36a54e1edcd1

Subscribe to this mod's changes

nyxid-service-skill-authoring is a skill published in the GitHub repository ChronoAIProject/NyxID (36 stars, last pushed yesterday), licensed Apache-2.0. It adds 136 tokens to every session and 2,572 once invoked, about $0.0007 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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