Agent skill

Nekocap Extension Messaging

GPL-3.0Auto-check passedMedia & Creative

Install Nekocap Extension Messaging

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .claude/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .claude/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .agents/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .agents/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .cursor/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .cursor/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nopol10/nekocap.git --path .agents/skills/nekocap-extension-messaging

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .gemini/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .gemini/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .github/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .github/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nopol10/nekocap nekocap-extension-messaging --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nopol10/nekocap.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/nekocap-extension-messaging .opencode/skills/nekocap-extension-messaging && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "nekocap-extension-messaging" agent skill from https://github.com/nopol10/nekocap/tree/master/.agents/skills/nekocap-extension-messaging into .opencode/skills/nekocap-extension-messaging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "nekocap-extension-messaging", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: nekocap-extension-messaging
GitHub stars: 105
Token cost: ~1.4k tokens
SKILL.md length: 587 words
Files: 1
Skills in repo: 5
Repo updated: Oct 3, 2026
First seen: Oct 7, 2026
Licence: GPL-3.0

At a glance

Works in 5 steps: Add the entry to the appropriate enum in… → Define its payload — either extend… → Add the handler. Background hub:… → …
Modifying communication between the extensions background
SKILL.md covers The message contract lives in…, Adding a new message — 5 steps, Renaming or removing a message and MV3 CSP is restrictive, plus 5 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Nekocap Extension Messaging is an agent skill from nopol10/nekocap. Use when modifying communication between the extension's background, content, popup, or canvas-iframe processes — adding or renaming a ChromeMessageType, changing the manifest's content-script matches, adding a new video platform, or anything touching MV3 CSP / cross-browser (Chrome vs Firefox) behavior.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Media & Creative. The repository describes itself as: Browser extension for creating & uploading community captions for YouTube, niconico and other video sharing sites. The licence is GPL-3.0.

When your agent uses it

Modifying communication between the extensions background
Canvas-iframe processes — adding
Renaming a ChromeMessageType
Changing the manifests content-script matches

Example prompts

“/nekocap-extension-messaging”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Add the entry to the appropriate enum in src/common/types.ts.
Define its payload — either extend ChromeMessage (loose typing) or add a variant to the discriminated union that fits (e.g…
Add the handler. Background hub: src/extension/background/index.tsx. Content: src/extension/content/index.tsx. Popup…
Add the sender in whichever process initiates the message.
If the message participates in a Redux flow that touches persisted state, verify the state shape still serializes cleanly through…

What it can do on your machine

Read from SKILL.md and the folder at commit cf47362. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nekocap Extension Messaging loads about 1.4k tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 587 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~83
When it runs · the whole SKILL.md, loaded when a task matches: ~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nopol10/nekocap at commit cf47362, republished under its GPL-3.0 licence (© nopol10). 587 words, ~1,367 tokens.

Download SKILL.mdSave it as .claude/skills/nekocap-extension-messaging/SKILL.md (or your agent's skills folder).

name: nekocap-extension-messaging
description: Use when modifying communication between the extension's background, content, popup, or canvas-iframe processes — adding or renaming a ChromeMessageType, changing the manifest's content-script matches, adding a new video platform, or anything touching MV3 CSP / cross-browser (Chrome vs Firefox) behavior.

This skill covers the contract between the four extension processes (background, content, popup, canvas iframe) and the Manifest V3 / cross-browser constraints around them.

The message contract lives in `src/common/types.ts`

ChromeMessageType is the enum that names every message that crosses a process boundary. The current set:

enum ChromeMessageType {
  Route,
  GetProviderType,
  GetTabId,
  ContentScriptUpdate,
  SaveFile,
  RawCaption,
  InfoMessage,
  GetContentScriptVariables,
  Request,                  // XMLHttpRequest proxied via background
  ProviderRequest,          // BackendProvider call proxied via background
  VideoIframeToBackground,
  VideoIframeToContent,
}

Plus ParentToCanvasIframeMessageType / CanvasIframeToParentMessageType for the Octopus renderer iframe, and ChromeExternalMessageType (GoogleAuthCredentials) for OAuth completion.

There is no compile-time check that all senders match all receivers. A mismatch fails silently at runtime. Treat changes to this enum like a public API change.

Adding a new message — 5 steps

Add the entry to the appropriate enum in src/common/types.ts.
Define its payload — either extend ChromeMessage (loose typing) or add a variant to the discriminated union that fits (e.g. ParentToCanvasIframeMessage).
Add the handler. Background hub: src/extension/background/index.tsx. Content: src/extension/content/index.tsx. Popup: src/extension/popup/index.tsx. Canvas iframe: src/extension/content/canvas-iframe/.
Add the sender in whichever process initiates the message.
If the message participates in a Redux flow that touches persisted state, verify the state shape still serializes cleanly through reduxed-chrome-storage (see the nekocap-redux-feature skill).

Renaming or removing a message

Search every directory for the old name: background/, content/, popup/, canvas-iframe/, and src/common/. A missed sender will silently no-op — the receiver just won't fire. Lint and type errors will not catch this.

MV3 CSP is restrictive

extension_pages CSP allows only 'self', *.google.com, and 'wasm-unsafe-eval'. The following silently break the extension on load:

CDN-loaded scripts (jsdelivr, unpkg, …)
Inline <script> tags
eval() or new Function("...")
Dynamically imported scripts from any non-self origin

All runtime code must be bundled by Vite (see build-extension.ts). If you need a library, install it via npm so it ends up in the bundle.

Adding a new video platform

A new platform requires both of the following — missing either silently breaks injection:

Processor registry entry — add to src/common/feature/video/utils.ts. This handles platform detection, video element selection, time/duration access, etc.
Content-script matches — add the URL pattern to content_scripts[].matches in both extension-statics/manifest-chrome.json and extension-statics/manifest-firefox.json. The CSS-at-document-start and JS-at-document-end pair must both target the new pattern.

Optional: a URL rewrite in middleware.ts if the platform exposes share/embed URLs you want to redirect to /create.

Show full SKILL.md (235 more words)Show less

Cross-browser notes

Manifests are templated per target in extension-statics/manifest-<target>.json and combined by build-extension.ts.
Firefox uses browser_specific_settings.gecko.id = nekocaption@gmail.com.
The project does not use webextension-polyfill — it calls the chrome.* namespace directly. Firefox supports chrome.* aliases for the APIs in use.
Firebase auth uses the firebase/auth/web-extension entry point for both browsers.

No Sentry on the extension

Sentry is only configured for the Next.js web app. Errors thrown in background/, content/, popup/, or canvas-iframe/ are not reported anywhere — they only land in the devtools console. Be conservative about throwing across process boundaries; prefer returning error payloads in the message response.

When you change X, also check Y

If you change…	Also verify…
`ChromeMessageType` enum	Every sender and handler across all four extension processes still matches
A message payload shape	Both serialization (sender side) and deserialization (handler side) updated
Content-script match list	Both `manifest-chrome.json` AND `manifest-firefox.json` updated
Add a video platform	Both the processor registry AND the manifest matches updated
Add a new CSP-restricted dependency	It's bundled by Vite, not loaded from a CDN

Anti-patterns

Don't introduce eval, new Function, inline scripts, or CDN imports — MV3 CSP will block them.
Don't rename a ChromeMessageType value without a full repo-wide grep for the old name.
Don't update only one manifest template — Chrome and Firefox must stay in sync.
Don't install webextension-polyfill — the project uses raw chrome.* deliberately.
Don't throw uncaught errors in background/ / content/ — they vanish silently. Return an error payload.

Files

Just SKILL.md in .agents/skills/nekocap-extension-messaging of nopol10/nekocap.

Open the folder on GitHubat commit cf47362

Compare with similar skills

Nekocap Extension Messaging next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Nekocap Extension Messaging compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Nekocap Extension Messaging this skillnopol10/nekocap	105	—	~1.4k	Automated safety check: Pass	GPL-3.0	7 days ago
Guizang Social Cardsop7418/guizang-social-card-skill	7.4k	1 repos	~7.8k	Automated safety check: Pass	AGPL-3.0	3 mo ago
Weekly Changelog Videoheygen-com/hyperframes	60k	—	~3.3k	Automated safety check: Pass	Apache-2.0	today
Anthropic Brand Stylinganthropics/skills	180k	30 repos	~559	Automated safety check: Pass	Apache-2.0	yesterday
MoneyPrinterTurbo Video Generatorharry0703/MoneyPrinterTurbo	129k	—	~2.1k	Automated safety check: Warn	MIT	today
HyperFrames Media Useheygen-com/hyperframes	60k	—	~2.4k	Automated safety check: Pass	Apache-2.0	today

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Questions about Nekocap Extension Messaging

What does Nekocap Extension Messaging do?

A skill your agent uses when modifying communication between the extension's background, content, popup, or canvas-iframe processes — adding or renaming a ChromeMessageType, changing the manifest's…. Nekocap Extension Messaging is an agent skill from nopol10/nekocap. Use when modifying communication between the extension's background, content, popup, or canvas-iframe processes — adding or renaming a ChromeMessageType, changing the manifest's content-script matches, adding a new video platform, or anything touching MV3 CSP / cross-browser (Chrome vs Firefox) behavior.

When should I use Nekocap Extension Messaging?

Nekocap Extension Messaging fits situations like: modifying communication between the extensions background; canvas-iframe processes — adding; renaming a ChromeMessageType; changing the manifests content-script matches.

How do I install Nekocap Extension Messaging in Claude Code?

Run `npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a claude-code`. Or copy the skill folder (.agents/skills/nekocap-extension-messaging in nopol10/nekocap) into .claude/skills/nekocap-extension-messaging in your project. Claude Code loads it when a task matches its description.

How do I install Nekocap Extension Messaging in Codex?

Run `npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a codex`. Or copy the skill folder (.agents/skills/nekocap-extension-messaging in nopol10/nekocap) into .agents/skills/nekocap-extension-messaging in your project. Codex loads it when a task matches its description.

Can I use Nekocap Extension Messaging in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nopol10/nekocap --skill nekocap-extension-messaging -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nekocap-extension-messaging, .gemini/skills/nekocap-extension-messaging, .github/skills/nekocap-extension-messaging and .opencode/skills/nekocap-extension-messaging in your project.

What does Nekocap Extension Messaging need to run?

SKILL.md names no scripts, command-line tools or credentials: Nekocap Extension Messaging is instructions for the agent only.

Does Nekocap Extension Messaging access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Nekocap Extension Messaging safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nekocap Extension Messaging use?

Nekocap Extension Messaging is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Nekocap Extension Messaging use?

About 1.4k tokens (SKILL.md is roughly 5.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Nekocap Extension Messaging?

Skills that share tags, products or a category with Nekocap Extension Messaging: Guizang Social Cards (op7418/guizang-social-card-skill, 7.4k stars), Weekly Changelog Video (heygen-com/hyperframes, 60k stars), Anthropic Brand Styling (anthropics/skills, 180k stars) and MoneyPrinterTurbo Video Generator (harry0703/MoneyPrinterTurbo, 129k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nekocap Extension Messaging?

nopol10 (a GitHub user) maintains it in nopol10/nekocap, which has 105 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 3, 2026.

Source: nopol10/nekocap on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Nekocap Extension Messaging

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

The message contract lives in src/common/types.ts

Adding a new message — 5 steps

Renaming or removing a message

MV3 CSP is restrictive

Adding a new video platform

Cross-browser notes

No Sentry on the extension

When you change X, also check Y

Anti-patterns

Files

Compare with similar skills

Similar skills

More from nopol10/nekocap

Related

Questions about Nekocap Extension Messaging

The message contract lives in `src/common/types.ts`