What is MultiPost-Extension CLAUDE.md?

Project instructions for a browser extension that publishes text, articles, video, and podcasts to multiple social platforms. They describe the Svelte-based build setup, development commands, and the code areas for each content type.

Use them when developing, building, linting, or finding the platform-specific publishing code in the MultiPost browser extension.

They give coding agents the repository's structure and safe development commands instead of making them infer how the extension works. This reduces changes in the wrong part of the project.

MultiPost-Extension CLAUDE.md — Instructions file for coding agents by leaperone: Project instructions for a browser extension that publishe

About the project

MultiPost-Extension is a browser extension that publishes text, images, videos, and other content to multiple social media platforms from one operation. Content creators use it to distribute a single piece of content across supported platforms, and web applications or scripts can call its extension or REST APIs.

leaperone/MultiPost-Extension · 3,278 stars · on GitHub · multipost.app

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.

agentmods

npx agentmods add instructions/leaperone/multipost-extension/claude-md

Clone the repo

git clone --depth 1 https://github.com/leaperone/MultiPost-Extension

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/instructions/leaperone/multipost-extension/claude-md.svg)](https://agentmods.dev/instructions/leaperone/multipost-extension/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/leaperone/multipost-extension/claude-md"><img src="https://agentmods.dev/badge/instructions/leaperone/multipost-extension/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 901 This file is loaded in full into every session.

When invoked 901 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.00901	$0.00901
Opus 5	$0.00451	$0.00451
Sonnet 5	$0.00180	$0.00180
Haiku 4.5	$0.00090	$0.00090

Measured today against content hash 8435cb319f51, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

MultiPost-Extension CLAUDE.md 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 today.

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.

CLAUDE.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

MultiPost is a browser extension that enables one-click content publishing to multiple social media platforms. Built with Plasmo framework, it supports 30+ platforms including Zhihu, Weibo, Xiaohongshu, Bilibili, X, Instagram, and more.

Development Commands

pnpm dev          # Start development server with hot reload
pnpm build        # Build and package extension for production
pnpm lint         # Run ESLint
pnpm lint:fix     # Auto-fix ESLint issues

Note: Do not run pnpm build for testing during development. Use pnpm dev instead.

Architecture

Content Types

The extension handles four content types, each with platform-specific implementations:

Dynamic (src/sync/dynamic/): Short-form posts (text, images)
Article (src/sync/article/): Long-form articles with HTML/Markdown
Video (src/sync/video/): Video uploads with metadata
Podcast (src/sync/podcast/): Audio content

Core Data Structures (`src/sync/common.ts`)

SyncData: Main payload containing platforms list, content data, and auto-publish flag
PlatformInfo: Platform configuration including inject URL and function
DynamicData, ArticleData, VideoData, PodcastData: Content-specific interfaces

Platform Integration Pattern

Each platform has an injectFunction that:

Opens the platform's publishing page (injectUrl)
Uses DOM manipulation to fill in content
Handles file uploads and form submissions

Platform maps: DynamicInfoMap, ArticleInfoMap, VideoInfoMap, PodcastInfoMap

Extension Components

Background (src/background/): Service worker handling message routing, tab management, API services
Popup (src/popup/): Extension popup UI
Sidepanel (src/sidepanel/): Side panel interface
Content Scripts (src/contents/): Page helpers and scrapers
Tabs (src/tabs/): Standalone pages (publish, refresh-accounts, trust-domain)

Read the full file on GitHub · 96 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.

today First seen · 96 lines · 901 tokens per session scan A 8435cb319f51

Subscribe to this mod's changes

MultiPost-Extension CLAUDE.md is an instructions file published in the GitHub repository leaperone/MultiPost-Extension (3,278 stars, last pushed 4d ago), licensed Apache-2.0. It adds 901 tokens to every session, about $0.0045 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 2026-09-04.

Browser automation article automation content-platform marketing marketing-automation social-media

MultiPost-Extension CLAUDE.md

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md

Project Overview

Development Commands

Architecture

Content Types

Core Data Structures (`src/sync/common.ts`)

Platform Integration Pattern

Extension Components

What this file has done since we first saw it

Other instructions, from other repositories

evc AGENTS.md

marketing-repo-template CLAUDE.md

marketingskills AGENTS.md

sniff AGENTS.md

redbeacon AGENTS.md

browser_oxide AGENTS.md

MultiPost-Extension CLAUDE.md

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md

Project Overview

Development Commands

Architecture

Content Types

Core Data Structures (src/sync/common.ts)

Platform Integration Pattern

Extension Components

What this file has done since we first saw it

Other instructions, from other repositories

evc AGENTS.md

marketing-repo-template CLAUDE.md

marketingskills AGENTS.md

sniff AGENTS.md

redbeacon AGENTS.md

browser_oxide AGENTS.md

Core Data Structures (`src/sync/common.ts`)