What is downloader-mcp CLAUDE.md?

A set of project instructions for a TypeScript MCP server that connects download clients such as SABnzbd and qBittorrent. It documents the project status, technology choices, Docker setup, and why the two clients use separate integrations.

Use it when developing, debugging, or extending the downloader-mcp server and its SABnzbd or qBittorrent connections.

It gives an coding agent the project context needed to work consistently, including the different request and authentication methods used by each download client.

How CarlDog/downloader-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to CarlDog/downloader-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.

Copy the file

curl -O https://raw.githubusercontent.com/CarlDog/downloader-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/CarlDog/downloader-mcp

Made for: Claude Code.

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/carldog/downloader-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/carldog/downloader-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/carldog/downloader-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/carldog/downloader-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/carldog/downloader-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/carldog/downloader-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,242 This file is loaded in full into every session.

When invoked 2,242 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 91% copy Near-identical to another mod 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	$0.02242	$0.02242
Opus 5	$0.01121	$0.01121
Sonnet 5	$0.00448	$0.00448
Haiku 4.5	$0.00224	$0.00224

Measured 9d ago against content hash 63cd8be04f2e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

downloader-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 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.

Origin

This is a copy

91% identical to downloader-mcp AGENTS.md — 12 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 194 lines

How it starts

The opening of the file, as written. The whole thing — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.

downloader-mcp

MCP server for download clients (SABnzbd, qBittorrent), packaged as a Docker container. Designed as a companion to media-management MCPs like servarr-mcp.

Status

Single source of truth: STATUS.md. Do not duplicate status into this file, MEMORY.md, or Serena memories — reference STATUS.md.

Current Sprint

Phase: deployed and verified (NAS) — see STATUS.md for the active phase, what's done, and what's next.

Stack

TypeScript (Node 22+, ESM, NodeNext module resolution)
@modelcontextprotocol/sdk (high-level McpServer API)
zod for tool input schemas
Each client uses its own auth/HTTP shape (no shared base — see below)
Docker multi-stage build (alpine, non-root user mcp)

Why no shared base class

Unlike servarr-mcp (where Sonarr/Radarr/Lidarr/Readarr/Prowlarr share a v1/v3 REST + X-Api-Key shape), SABnzbd and qBittorrent have nothing in common at the API layer:

SABnzbd: query-string GET API (/api?mode=queue&apikey=X&output=json). Single endpoint, mode-driven dispatch.
qBittorrent: REST-ish (/api/v2/...) with a static Authorization: Bearer <API key> header on every request.

Each client is fully self-contained in its own file. Adding a third client (Deluge, Transmission, NZBGet, etc.) means a new file and a new optional registration in src/index.ts — no inheritance refactor.

Layout

src/index.ts — MCP server entry. Computes which clients are enabled from env vars at startup, then decides transport (stdio vs HTTP) based on MCP_PORT. Per-session McpServer instances via the createServer() factory.
src/mcp-route.ts — the Streamable HTTP /mcp route: bearer auth, per-session transport map, idle sweep, session dispatch. Split out of index.ts so it can be imported by a test — index.ts self-executes on import (and exit(1)s with no client configured), so nothing in it was reachable without booting a server. Covered by src/mcp-route.test.ts.
src/util.ts — asText(), redactSecrets(), and fetchWithCause() (wraps fetch so a network-level failure surfaces its real cause instead of the generic fetch failed), all shared by both clients.
src/sabnzbd.ts — SabnzbdClient + registerSabnzbdTools.
src/qbittorrent.ts — QBittorrentClient (static Bearer API-key auth) + registerQbittorrentTools.
Dockerfile — multi-stage build (alpine, non-root user).
docker-compose.yml — Compose/Portainer deployment using HTTP transport.
.githooks/pre-commit — gitleaks + PII pattern scan.

Read the full file on GitHub · 194 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.

9d ago First seen · 194 lines · 2,242 tokens per session scan A 63cd8be04f2e

Subscribe to this mod's changes

downloader-mcp CLAUDE.md is an instructions file published in the GitHub repository CarlDog/downloader-mcp (0 stars, last pushed today), licensed MIT. It adds 2,242 tokens to every session, about $0.0112 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to downloader-mcp AGENTS.md, differing in 12 lines, and is treated as a copy.

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downloader-mcp: Instructions file for Claude Code