open-crypto-puzzles: Instructions file for Codex

AGENTS.md

open-crypto-puzzles AGENTS.md is an instructions file for Codex, OpenCode from floflo777/open-crypto-puzzles. It costs 1,175 tokens per session, scanned A, original, no licence file.

Repository instructions for solving open-crypto-puzzles, including the project's purpose, puzzle workflow, rules, and starter prompt. The repository is associated with cryptography puzzles, but the description gives no further details.

In plain words
What is it for?
Starting a puzzle, following its workflow, and checking work against the repository's rules.
Why use it?
They provide the steps and constraints an agent should follow when working on a puzzle.

Instructions file for CodexOpenCode

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

This is floflo777/open-crypto-puzzles's own configuration. It tells Codex and OpenCode how to work on open-crypto-puzzles 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-crypto-puzzles configures →

Reuse

Borrowing it

Nothing to install: this file belongs to floflo777/open-crypto-puzzles. 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/floflo777/open-crypto-puzzles/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/floflo777/open-crypto-puzzles

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-crypto-puzzles AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/floflo777/open-crypto-puzzles/agents-md/github.svg)](https://agentmods.dev/instructions/floflo777/open-crypto-puzzles/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/floflo777/open-crypto-puzzles/agents-md"><img src="https://agentmods.dev/badge/instructions/floflo777/open-crypto-puzzles/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-crypto-puzzles AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/floflo777/open-crypto-puzzles/agents-md"><img src="https://agentmods.dev/badge/instructions/floflo777/open-crypto-puzzles/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,175 This file is loaded in full into every session.
When invoked 1,175 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 unknown 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 $0.01175 $0.01175
Opus 5.5 $0.00470 $0.00470
Sonnet 5.5 $0.00235 $0.00235
Haiku 4.5 $0.00118 $0.00118

Measured 2mo ago against content hash 2a54d41e6997, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

open-crypto-puzzles 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 · 87 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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 · 87 lines · 1,175 tokens per session scan A 2a54d41e6997

Subscribe to this mod's changes

open-crypto-puzzles AGENTS.md is an instructions file published in the GitHub repository floflo777/open-crypto-puzzles (221 stars, last pushed today), with no licence file. It adds 1,175 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.

Related

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open-crypto-puzzles AGENTS.md next to 6 instructions from other repositories
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deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file275k2d agoMITA4,313Codex, OpenCode