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.
curl -O https://raw.githubusercontent.com/jakub-k-slys/substack-gateway-oss/main/AGENTS.mdgit clone --depth 1 https://github.com/jakub-k-slys/substack-gateway-ossWrote 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/jakub-k-slys/substack-gateway-oss/agents-md)<a href="https://agentmods.dev/instructions/jakub-k-slys/substack-gateway-oss/agents-md"><img src="https://agentmods.dev/badge/instructions/jakub-k-slys/substack-gateway-oss/agents-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/jakub-k-slys/substack-gateway-oss/agents-md"><img src="https://agentmods.dev/badge/instructions/jakub-k-slys/substack-gateway-oss/agents-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 | $0.01177 | $0.01177 |
| Opus 5.5 | $0.00471 | $0.00471 |
| Sonnet 5.5 | $0.00235 | $0.00235 |
| Haiku 4.5 | $0.00118 | $0.00118 |
Grade A, and why
substack-gateway-oss AGENTS.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.
How it starts
The opening of the file, as written. The whole thing — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure & Module Organization
The root src/substack_gateway/ package composes the Starlette app (app_factory.py, api_app.py, mcp_app.py, registry.py, ext_loader.py, runtime.py); it does not hold domain logic itself. packages/gateway_core/ is the shared foundation: auth, HTTP clients, config, the capability protocol, converters, and models. Each domain (notes, posts, profiles, following, comments, drafts, stats, ...) ships as a trio of packages — gateway_<domain> for the service layer, gateway_<domain>_rest for its FastAPI router, gateway_<domain>_mcp for its FastMCP tools — each _rest/_mcp package registering itself through the substack_gateway.capabilities entry-point group. me is an exception: gateway_me_rest/gateway_me_mcp exist as a two-package (REST + MCP only) capability pair with no gateway_me service package, composing NotesService, PostsService, and ProfilesService from other domains instead. packages/gateway_oss/ is now an aggregator: health routes, the extension protocol, versioning, and backward-compat shims. Unit tests live under each package's tests/; BDD coverage is in packages/gateway_oss/features/ with step definitions under features/steps/. Use packages/gateway_oss/samples/ for request examples and treat dist/ as build output.
Build, Test, and Development Commands
Install the pinned toolchain and dev dependencies with uv sync --all-packages --dev. Run the app locally with uv run python -m substack_gateway.main; this serves the API and MCP endpoints on port 5001 by default. Build distributable artifacts with uv build --all-packages.
Quality checks:
uv run ruff check .runs lint rules.uv run ruff format --check .verifies formatting.uv run ty check .runs static type checks.uv build --all-packagesverifies every package builds.uv run pytestruns unit tests across every package, includingpackages/gateway_drafts/tests/andpackages/gateway_stats/tests/, plus the pytest-bdd integration scenarios inpackages/gateway_oss/features/.uv run pytest packages/gateway_oss/features/runs only the BDD integration scenarios.uv run pytest packages/gateway_oss/e2e/runs the live E2E scenarios againstSUBSTACK_GATEWAY_BASE_URL(or a local gateway on port5001); they are skipped when neither is reachable and are not part of plainuv run pytest.
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.
- 12d ago Changed · +1 lines · +80 tokens per session 00543000388a
- 1mo ago Changed · -17 tokens per session ba8556652d31
- 2mo ago Changed · +2 lines · +311 tokens per session 45a8fa745051
- 2mo ago First seen · 32 lines · 803 tokens per session scan A 21603e2e245a
substack-gateway-oss AGENTS.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 1,177 tokens to every session, about $0.0047 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.
substack-gateway-oss AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| substack-gateway-oss AGENTS.mdjakub-k-slys/substack-gateway-oss | Instructions file | 40 | 2d ago | MIT | A | 1,177 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |