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open-strix: Instructions file for Codex

AGENTS.md

open-strix AGENTS.md is an instructions file for Codex, OpenCode from tkellogg/open-strix. It costs 156 tokens per session, scanned A, original, MIT.

A set of coding instructions for the open-strix project, covering Python use, code quality, testing, types, and monitoring. It tells the coding agent which tools and practices to follow while working in the repository.

In plain words
What is it for?
Use it when adding or changing Python code, installing dependencies, writing tests, defining types, or adding monitoring. It is also a reference for keeping implementations clear and checking boundaries between systems.
Why use it?
It reduces inconsistent development choices, such as running Python with the wrong tool or testing only isolated pieces. It also makes the project’s coding and review expectations explicit.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is tkellogg/open-strix's own configuration. It tells Codex and OpenCode how to work on open-strix 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 open-strix configures →

not rated 96repo +1 3mo ago A scan 156 tokens original MIT
View source ↗ tkellogg/open-strix
Reuse

Borrowing it

Nothing to install: this file belongs to tkellogg/open-strix. 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/tkellogg/open-strix/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/tkellogg/open-strix

Made for: Codex, OpenCode.

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.

agentmods badge for open-strix AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/tkellogg/open-strix/agents-md"><img src="https://agentmods.dev/badge/instructions/tkellogg/open-strix/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.

agentmods 80×15 button for open-strix AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/tkellogg/open-strix/agents-md"><img src="https://agentmods.dev/badge/instructions/tkellogg/open-strix/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 156 This file is loaded in full into every session.
When invoked 156 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 $0.00156 $0.00156
Opus 5.5 $0.00062 $0.00062
Sonnet 5.5 $0.00031 $0.00031
Haiku 4.5 $0.00016 $0.00016

Measured 2mo ago against content hash deb7a4ef8f63, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

open-strix 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 2mo 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.

AGENTS.md · 11 lines

What it actually says

Python

  • Use uv always to access anything python, uv add to install, uv run to run anything
  • Write frequent but clear and terse comments
  • Generally don't catch exceptions. In a web context, let the top-level handler catch it. Only use try/except if you're in a context that doesn't handle errors. It's sometimes fine to catch exceptions, in places where that's the most expedient way to gain information.
  • Focus on writing clear code that's easy to follow.

Quality

  • Use higher level tests to ensure that code works. Focus tests on things that are likely to break, like the boundaries between systems.
  • Use types extensively to maintain contracts and enforce logic.
  • Use monitoring to observe how the agent works.
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. 2mo ago First seen · 11 lines · 156 tokens per session scan A deb7a4ef8f63

Subscribe to this mod's changes

open-strix AGENTS.md is an instructions file published in the GitHub repository tkellogg/open-strix (96 stars, last pushed 3mo ago), licensed MIT. It adds 156 tokens to every session, about $0.0006 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.

Related

open-strix AGENTS.md compared with instructions from other repositories

open-strix AGENTS.md next to 6 instructions from other repositories
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open-strix AGENTS.mdtkellogg/open-strixInstructions file963mo agoMITA156Codex, OpenCode
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vscode model-prompts.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA2,022GitHub Copilot