Borrowing it
Nothing to install: this file belongs to stefaniuk/loadout. 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/stefaniuk/loadout/main/.github/instructions/python.instructions.mdgit clone --depth 1 https://github.com/stefaniuk/loadoutWrote 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/stefaniuk/loadout/python)<a href="https://agentmods.dev/instructions/stefaniuk/loadout/python"><img src="https://agentmods.dev/badge/instructions/stefaniuk/loadout/python/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/stefaniuk/loadout/python"><img src="https://agentmods.dev/badge/instructions/stefaniuk/loadout/python.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 | $0.16660 | $0.16660 |
| Opus 5.5 | $0.06664 | $0.06664 |
| Sonnet 5.5 | $0.03332 | $0.03332 |
| Haiku 4.5 | $0.01666 | $0.01666 |
Grade A, and why
loadout python.instructions.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 1mo 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 — 1,125 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Python Engineering Instructions (CLI + API, framework-agnostic) 🐍
These instructions define the default engineering approach for building modern, production-grade Python CLIs and APIs.
They must remain applicable to:
- Minimal CLIs (standard library
argparse) - Command frameworks (for example Typer, Click)
- Rich output and TUIs (for example Rich, Textual, prompt_toolkit)
- Django (including Django REST Framework)
- FastAPI (ASGI)
- AWS Lambda–hosted APIs (for example API Gateway + Lambda, function URLs, or containers)
They are non-negotiable unless an exception is explicitly documented (with rationale and expiry) in an ADR/decision record.
Identifier scheme. Every normative rule carries a unique tag in the form [PY-<prefix>-NNN], where the prefix maps to the containing section (for example OP for Operating Principles, LCL for Local-first developer experience, QG for Quality Gates, continuing through AI for AI-assisted expectations). Use these identifiers when referencing, planning, or validating requirements.
0. Quick reference (apply first) 🧠
This section exists so humans and AI assistants can reliably apply the most important rules even when context is tight.
- [PY-QR-001] Specification first: treat the specification as the source of truth for behaviour ([PY-OP-001]).
- [PY-QR-002] Small, safe changes: prefer small, explicit, testable changes ([PY-OP-002], [PY-OP-006]).
- [PY-QR-003] Fast feedback: local development and tests must be quick and confidence-building ([PY-OP-007], [PY-LCL-001]–[PY-LCL-008]).
- [PY-QR-004] Run the quality gates after any code/test change and iterate to clean ([PY-QG-001]–[PY-QG-005]).
- [PY-QR-005] Validate at boundaries and reject ambiguous inputs ([PY-DATA-001]–[PY-DATA-003]).
- [PY-QR-006] Deterministic outputs: stable ordering, stable field naming, no hidden randomness ([PY-OP-003], [PY-CTR-007]).
- [PY-QR-007] Correct CLI streams: stdout for primary output, stderr for diagnostics ([PY-BEH-008]–[PY-BEH-011]).
- [PY-QR-008] No secrets in args or logs: use env vars or secure prompts; never print secrets ([PY-SEC-001]–[PY-SEC-004], [PY-OBS-013]).
- [PY-QR-009] Local by default: no real cloud/network by default; use fakes/emulators; explicit integration mode switches ([PY-EXT-001]–[PY-EXT-007]).
- [PY-QR-010] Operational visibility: correlation IDs and structured logs for APIs; controlled diagnostics only ([PY-OBS-004]–[PY-OBS-010], [PY-OBS-015]–[PY-OBS-026], [PY-ERR-013]).
- [PY-QR-011] Static typing is mandatory: type hints + static analysis (mypy) are the critical safety net for AI-generated code; enforce in CI ([PY-TYP-001]–[PY-TYP-012]).
- [PY-QR-012] Avoid common anti-patterns: bare
except, mutable defaults,assertfor validation, global mutable state, untyped public APIs (§6, §21).
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.
- 1mo ago First seen · 1,125 lines · 16,660 tokens per session scan A 7e6e7a8ab17d
loadout python.instructions.md is an instructions file published in the GitHub repository stefaniuk/loadout (1 stars, last pushed yesterday), licensed MIT. It adds 16,660 tokens to every session, about $0.0666 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 2026-08-31.
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