substack-gateway-oss: Instructions file for Claude Code

CLAUDE.md

substack-gateway-oss CLAUDE.md is an instructions file for Claude Code from jakub-k-slys/substack-gateway-oss. It costs 2,674 tokens per session, scanned A, original, MIT.

Repository instructions for the Substack Gateway OSS project, a codebase that provides access to Substack through an API and MCP endpoints. They document how to install, run, check, test, and build the project.

In plain words
What is it for?
Use them when changing this repository to find its development commands, linting and type-checking steps, unit tests, integration tests, and build process.
Why use it?
They give a coding agent the project's expected commands and validation steps, reducing mistakes caused by using the wrong tools or checks.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is jakub-k-slys/substack-gateway-oss's own configuration. It tells Claude Code how to work on substack-gateway-oss itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything substack-gateway-oss configures →

Reuse

Borrowing it

Nothing to install: this file belongs to jakub-k-slys/substack-gateway-oss. 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/jakub-k-slys/substack-gateway-oss/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/jakub-k-slys/substack-gateway-oss

Made for: Claude Code.

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Per session 2,674 This file is loaded in full into every session.
When invoked 2,674 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 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 5.1 $0.02674 $0.02674
Opus 5.5 $0.01070 $0.01070
Sonnet 5.5 $0.00535 $0.00535
Haiku 4.5 $0.00267 $0.00267

Measured 12d ago against content hash db42e5e92923, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

substack-gateway-oss 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 12d 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 · 172 lines

How it starts

The opening of the file, as written. The whole thing — 172 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.

Commands

# Install dependencies (dev included, all workspace members)
uv sync --all-packages --dev

# Run the server (dev mode with reload)
uv run python -m substack_gateway.main

# Lint
uv run ruff check .

# Format check / fix
uv run ruff format --check .
uv run ruff format .

# Type-check
uv run ty check .

# Unit tests (pytest)
uv run pytest packages/gateway_oss/tests/
uv run pytest packages/gateway_drafts/tests/
uv run pytest packages/gateway_stats/tests/

# Run a single test file
uv run pytest packages/gateway_oss/tests/test_markdown.py

# BDD integration tests (pytest-bdd; also part of plain `uv run pytest`)
uv run pytest packages/gateway_oss/features/

# Run matching BDD scenarios by name
uv run pytest packages/gateway_oss/features/ -k "draft"

# Live E2E tests (pytest-bdd) against SUBSTACK_GATEWAY_BASE_URL or a local gateway on :5001
uv run pytest packages/gateway_oss/e2e/

# Build all workspace packages (shell + gateway_core + every domain trio)
uv build --all-packages

When introducing changes, validate them before finishing the task. Prefer targeted runs first, but the expected OSS validation set is:

  • uv run ruff check .
  • uv run ruff format --check .
  • uv run ty check .
  • uv build --all-packages
  • uv run pytest (includes the BDD scenarios in packages/gateway_oss/features/)

Before committing or pushing, always run the relevant lint, format, type-check, and test commands for the touched area. Do not skip validation just because the change looks small.

Commit and PR titles must use Conventional Commits / semver-style prefixes such as feat:, fix:, chore:, docs:, refactor:, test:, or ci:. Prefer the narrowest correct prefix and keep the subject concise and imperative. For breaking changes, use Conventional Commits semver signaling with ! in the type or scope, and/or include a BREAKING CHANGE: footer in the commit body.

Read the full file on GitHub · 172 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.

  1. 12d ago Changed · +3 lines · +222 tokens per session db42e5e92923
  2. 1mo ago Changed · -2 lines · -78 tokens per session f6b6595877f3
  3. 1mo ago Changed · +88 tokens per session 0eed4cbab7bd
  4. 2mo ago Changed · +29 lines · +720 tokens per session 64ed92f81e3c
  5. 2mo ago First seen · 142 lines · 1,722 tokens per session scan A d28814038cbe

Subscribe to this mod's changes

substack-gateway-oss CLAUDE.md is an instructions file published in the GitHub repository jakub-k-slys/substack-gateway-oss (40 stars, last pushed 2d ago), licensed MIT. It adds 2,674 tokens to every session, about $0.0107 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 2026-08-30.

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