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.
Borrowing it
Nothing to install: this file belongs to leaperone/MultiPost-Extension. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/leaperone/MultiPost-Extension/main/CLAUDE.mdgit clone --depth 1 https://github.com/leaperone/MultiPost-ExtensionWrote 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.
[](https://agentmods.dev/instructions/leaperone/multipost-extension/claude-md)<a href="https://agentmods.dev/instructions/leaperone/multipost-extension/claude-md"><img src="https://agentmods.dev/badge/instructions/leaperone/multipost-extension/claude-md/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.
<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="Reviewed on agentmods" width="80" height="20"></a>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 5.5 | $0.00360 | $0.00360 |
| Sonnet 5.5 | $0.00180 | $0.00180 |
| Haiku 4.5 | $0.00090 | $0.00090 |
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 1mo 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.
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 flagPlatformInfo: Platform configuration including inject URL and functionDynamicData,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)
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.
- 1mo ago First seen · 96 lines · 901 tokens per session scan A 8435cb319f51
MultiPost-Extension CLAUDE.md is an instructions file published in the GitHub repository leaperone/MultiPost-Extension (3,691 stars, last pushed 3d ago), licensed Apache-2.0. It adds 901 tokens to every session, about $0.0036 per session on Opus 5.5. 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.
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