agentmods.dev

substack-mcp CLAUDE.md

A project instruction file for developing the Substack MCP application, which has a FastAPI backend and a Vite React web interface. It documents ports, commands, storage, tool conventions, and quality checks.

In plain words
What is it for?
Use it when developing, testing, linting, formatting, building, or starting the Substack MCP backend and web interface.
Why use it?
It gives coding agents the project's required commands and conventions so they do not guess how to run, test, format, or structure the application.

Instructions file

1 2d ago A scan 338 tokens original MIT
View the source file sandraschi/substack-mcp
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/sandraschi/substack-mcp/claude-md
Clone the repo
git clone --depth 1 https://github.com/sandraschi/substack-mcp
Per session 338 This file is loaded in full into every session.
When invoked 338 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.

ModelPer sessionOnce invoked
Fable 5 $0.00338 $0.00338
Opus 5 $0.00169 $0.00169
Sonnet 5 $0.00068 $0.00068
Haiku 4.5 $0.00034 $0.00034

Measured 2d ago against content hash c3ea7b328f00, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

substack-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 2d 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.

CLAUDE.md · 46 lines

What it actually says

CLAUDE.md — substack-mcp Development Directives

Purpose: Agent instructions and quick reference commands for substack-mcp.

Port Allocation

  • Backend (FastAPI + FastMCP HTTP /mcp): 11163
  • Frontend Webapp (Vite React SPA): 11164

Commands

# Backend Dev Server
uv run python -m substack_mcp.server --port 11163

# Frontend Webapp Dev Server
cd webapp && npm run dev

# Unified Start Script (Clears port zombies, launches uvicorn & vite, opens browser)
powershell -ExecutionPolicy Bypass -File .\start.ps1

# Run Tests
uv run pytest

# Python Lint & Format
uv run ruff check .
uv run ruff format .

# Webapp Biome Lint & Format
cd webapp && npm run lint
cd webapp && npm run format

# Webapp Build
cd webapp && npm run build

# Run Full Quality Suite
just check

Conventions & Rules

  • FastMCP 3.1+: All tools must use the Portmanteau pattern (consolidated tools with an operation parameter).
  • SQLite Storage: All data persists in data/substack.sqlite3.
  • Ruff & Biome: Maintain 0 lint errors in both Python (ruff check) and TypeScript (biome check .).
  • No Bare Ports: Always clear ports 11163 and 11164 before binding.
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.

  1. 2d ago First seen · 46 lines · 338 tokens per session scan A c3ea7b328f00

Subscribe to this mod's changes

substack-mcp CLAUDE.md is an instructions file published in the GitHub repository sandraschi/substack-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 338 tokens to every session, about $0.0017 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.

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