decision-trail: Instructions file for Codex

AGENTS.md

decision-trail AGENTS.md is an instructions file for Codex, OpenCode from haevg-rz/decision-trail. It costs 7,440 tokens per session, scanned A, original, MIT.

A repository guide for a method called decision-trail, which records ideas, proposals, decisions, plans, and work in plain Markdown files.

In plain words
What is it for?
Use it to organize project decisions, link related ideas, track their progress through the work cycle, and update the method when real use reveals improvements.
Why use it?
It helps people resume work after a break and understand why changes were made without relying on hidden tools or memory.

Instructions file for CodexOpenCode

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

This is haevg-rz/decision-trail's own configuration. It tells Codex and OpenCode how to work on decision-trail 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 decision-trail configures →

Reuse

Borrowing it

Nothing to install: this file belongs to haevg-rz/decision-trail. 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/haevg-rz/decision-trail/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/haevg-rz/decision-trail

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 decision-trail AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/haevg-rz/decision-trail/agents-md/github.svg)](https://agentmods.dev/instructions/haevg-rz/decision-trail/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/haevg-rz/decision-trail/agents-md"><img src="https://agentmods.dev/badge/instructions/haevg-rz/decision-trail/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 decision-trail AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/haevg-rz/decision-trail/agents-md"><img src="https://agentmods.dev/badge/instructions/haevg-rz/decision-trail/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 7,440 This file is loaded in full into every session.
When invoked 7,440 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 $0.07440 $0.07440
Opus 5.5 $0.02976 $0.02976
Sonnet 5.5 $0.01488 $0.01488
Haiku 4.5 $0.00744 $0.00744

Measured 2mo ago against content hash 65dd8a752174, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

decision-trail 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 · 472 lines

How it starts

The opening of the file, as written. The whole thing — 472 lines — stays where its author put it; the contents beside it link to each section on GitHub.

decision-trail

A generic, reusable way to work on projects — economic, transparent, agile.

This file is the terse reference for how we work — the contract, lifecycle, layout, cross-link vocabulary, and how to start. For a narrative introduction that teaches the method, read guide.md. For why the method is the way it is, read decisions/ in order — it documents its own construction.

Status: settled (not frozen). The concept phase is logically complete — the contract and all mechanics below are decided and recorded as ADRs in decisions/. The method now exists to be used; real use will bring improvements, and any such change is made decision-trail — as a new ADR.

The contract — eight promises

  1. Continuity — pick up cheaply after the session ends.
  2. Economy — cheap to write, cheap to resume.
  3. Transparency — plain, human-readable markdown; nothing hidden in a tool.
  4. Lifecycle for thoughts — idea → proposal → decision → plan → execution.
  5. Agility — any thread can be refined or overthrown; nothing is locked.
  6. Budding — one idea can spawn another; the parent-child link is kept.
  7. Genericity — nothing is bound to a particular project.
  8. Borrow, don't invent — lean on existing portable standards (ADRs, spec-driven stages, agent hand-off files); invent nothing we can borrow.

Read the full file on GitHub · 472 lines

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 · 472 lines · 7,440 tokens per session scan A 65dd8a752174

Subscribe to this mod's changes

decision-trail AGENTS.md is an instructions file published in the GitHub repository haevg-rz/decision-trail (5 stars, last pushed 3mo ago), licensed MIT. It adds 7,440 tokens to every session, about $0.0298 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.

Related

decision-trail AGENTS.md compared with instructions from other repositories

decision-trail AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
decision-trail AGENTS.mdhaevg-rz/decision-trailInstructions file53mo agoMITA7,440Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode