A complete workflow for developing N.E.K.O plugins, which are extensions for the N.E.K.O platform. It covers plugin files, the software development kit, user-interface parts, runtime behavior, testing, packaging, and documentation.

Use it to create, edit, inspect, debug, validate, package, or document N.E.K.O plugins and their plugin.toml files.

It gives plugin work a consistent process and helps keep changes within the supported plugin area. It also provides rules for manifests, entry points, errors, storage, asynchronous code, and translations.

How Project-N-E-K-O/N.E.K.O configures Codex

About the project

N.E.K.O is a real-time AI catgirl companion designed to live with the user, initiate interaction, share media, and perform tasks through an emotional engine. It is intended for people seeking a proactive personal digital companion. The catalogue contains skills for working with it.

Project-N-E-K-O/N.E.K.O · 2,790 stars · on GitHub · store.steampowered.com

Reuse

Borrowing it

Nothing to install: this file belongs to Project-N-E-K-O/N.E.K.O. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Project-N-E-K-O/N.E.K.O/main/.agent/skills/neko-plugin/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Project-N-E-K-O/N.E.K.O

Made for: Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/project-n-e-k-o/n.e.k.o/neko-plugin/github.svg)](https://agentmods.dev/skills/project-n-e-k-o/n.e.k.o/neko-plugin)

Your own site

<a href="https://agentmods.dev/skills/project-n-e-k-o/n.e.k.o/neko-plugin"><img src="https://agentmods.dev/badge/skills/project-n-e-k-o/n.e.k.o/neko-plugin/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/project-n-e-k-o/n.e.k.o/neko-plugin"><img src="https://agentmods.dev/badge/skills/project-n-e-k-o/n.e.k.o/neko-plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,341 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.

Model	Per session	Once invoked
Fable 5.1	$0.00073	$0.01341
Opus 5	$0.00036	$0.00671
Sonnet 5	$0.00015	$0.00268
Haiku 4.5	$0.00007	$0.00134

Measured 9d ago against content hash 119dbc3bf235, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

neko-plugin 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 9d 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.

.agent/skills/neko-plugin/SKILL.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

N.E.K.O Plugin

Use this as the single entry point for N.E.K.O plugin work. Keep the workflow continuous: understand the plugin contract, edit when needed, validate the result, and self-review before reporting back.

Non-Negotiables

Read references/execution-boundary.md before any plugin edit.
Read references/core-plugin-contract.md before changing plugin identity, manifest, entry code, SDK imports, UI surfaces, runtime settings, dependencies, or package type.
Default writable area is only plugin/plugins/<plugin_id>/.
Plugin workspaces live under repository-relative plugin/plugins/<plugin_id>/; read references/core-plugin-contract.md for the canonical file tree.
Docs, tests, examples, indexes, and platform source are read context; platform edits require explicit user request or confirmation.
Create standard plugin scaffolds with uv run neko-plugin init ...; do not hand-create the initial plugin directory, plugin.toml, or entry class.
Prefer public SDK facades: plugin.sdk.plugin, plugin.sdk.extension, plugin.sdk.adapter. Do not add new plugin.sdk.shared imports in plugin workspace code.
Runtime-triggered @plugin_entry handlers must be async def; plugin_runtime.auto_start=false is manual-start, not disabled or import-safe.
Prefer Hosted TSX for new interactive plugin UI, Markdown for read-only docs, and Static only for legacy standalone pages or unsupported browser/runtime needs.

Package Types

Choose package type from the manifest/SDK contract, not from feature vibes:

plugin: default independent feature. It can include entries, lifecycle/background work, timers, message handlers, UI, storage/settings, cross-plugin calls, and ordinary external API/device integrations.
extension: adds entries/hooks to an existing host plugin and requires [plugin.host].
adapter: bridges an external protocol or request stream into N.E.K.O plugin calls. Calling an external service is not enough to make something an adapter.

Read the full file on GitHub · 97 lines

Files

What ships with it

9 files 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.

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.

9d ago First seen · 97 lines · 73 tokens per session scan A 119dbc3bf235

Subscribe to this mod's changes

neko-plugin is a skill published in the GitHub repository Project-N-E-K-O/N.E.K.O (2,790 stars, last pushed today), licensed Apache-2.0. It adds 73 tokens to every session and 1,341 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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N.E.K.O: Skill for Codex