Borrowing it
Nothing to install: this file belongs to tulaman/youtube-watchlater-mcp. 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/tulaman/youtube-watchlater-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/tulaman/youtube-watchlater-mcpWrote 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/tulaman/youtube-watchlater-mcp/claude-md)<a href="https://agentmods.dev/instructions/tulaman/youtube-watchlater-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/tulaman/youtube-watchlater-mcp/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/tulaman/youtube-watchlater-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/tulaman/youtube-watchlater-mcp/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 | $0.00374 | $0.00374 |
| Opus 5 | $0.00187 | $0.00187 |
| Sonnet 5 | $0.00075 | $0.00075 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
youtube-watchlater-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What This Is
An MCP (Model Context Protocol) server that exposes a single tool get_watch_later to retrieve a user's YouTube Watch Later playlist via yt-dlp reading cookies from a local browser.
Runtime & Dependencies
- Node.js with ES modules (
"type": "commonjs"in package.json butserver.mjsuses ESM syntax — run with Node directly) - External system dependency:
yt-dlpmust be installed and on$PATH @modelcontextprotocol/sdkfor MCP server/transportzodfor input schema validation
Running the Server
node server.mjs
The server communicates over stdio (MCP StdioServerTransport). It is intended to be registered as an MCP server in a host like Claude Desktop, not run standalone in a browser.
MCP Tool: get_watch_later
- Input:
browser(chrome/brave/edge/firefox),limit(1–500, default 50),profile(optional browser profile name) - Mechanism: Shells out to
yt-dlp --cookies-from-browser <browser>[:<profile>] --flat-playlist --dump-json --playlist-end <limit> https://www.youtube.com/playlist?list=WL - Output: JSON array of
{ videoId, title, url, channel }objects
Architecture
The entire server is server.mjs — a single file with no routing layer, database, or config files. The only abstraction is runYtDlp(args) which wraps execFile in a Promise.
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.
- 11d ago First seen · 33 lines · 374 tokens per session scan A 16ea54cf3ce3
youtube-watchlater-mcp CLAUDE.md is an instructions file published in the GitHub repository tulaman/youtube-watchlater-mcp (1 stars, last pushed 6mo ago), licensed MIT. It adds 374 tokens to every session, about $0.0019 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 2026-08-31.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).