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.
npx agentmods add instructions/tkellogg/open-strix/agents-mdgit clone --depth 1 https://github.com/tkellogg/open-strixWhat 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 | $0.00156 | $0.00156 |
| Opus 5 | $0.00078 | $0.00078 |
| Sonnet 5 | $0.00031 | $0.00031 |
| Haiku 4.5 | $0.00016 | $0.00016 |
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 3d 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.
What it actually says
Python
- Use
uvalways to access anything python,uv addto install,uv runto 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.
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.
- 3d ago First seen · 11 lines · 156 tokens per session scan A deb7a4ef8f63
open-strix AGENTS.md is an instructions file published in the GitHub repository tkellogg/open-strix (84 stars, last pushed 29d ago), licensed MIT. It adds 156 tokens to every session, about $0.0008 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 2026-08-30.
Other instructions, from other repositories
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