What is codex-substrate-memory AGENTS.md?

Repository instructions for Substrate-memory, a project that provides organizational memory for OpenAI Codex through MCP tools and a notification hook.

Use them while changing or releasing the repository so its runtime, vendor files, diagnostics, secrets, and tests follow project rules.

They tell contributors how to preserve shared files, handle failures safely, protect credentials, and run the required release checks.

How Substrate-memory/codex-substrate-memory configures Codex and OpenC

Reuse

Borrowing it

Nothing to install: this file belongs to Substrate-memory/codex-substrate-memory. 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/Substrate-memory/codex-substrate-memory/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Substrate-memory/codex-substrate-memory

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/substrate-memory/codex-substrate-memory/agents-md/github.svg)](https://agentmods.dev/instructions/substrate-memory/codex-substrate-memory/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/substrate-memory/codex-substrate-memory/agents-md"><img src="https://agentmods.dev/badge/instructions/substrate-memory/codex-substrate-memory/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/substrate-memory/codex-substrate-memory/agents-md"><img src="https://agentmods.dev/badge/instructions/substrate-memory/codex-substrate-memory/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 83 This file is loaded in full into every session.

When invoked 83 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.

Model	Per session	Once invoked
Fable 5.1	$0.00083	$0.00083
Opus 5.5	$0.00033	$0.00033
Sonnet 5.5	$0.00017	$0.00017
Haiku 4.5	$0.00008	$0.00008

Measured 2mo ago against content hash 0895c0d48813, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

codex-substrate-memory 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 · 8 lines

What it actually says

Repository guidance

Keep src/substrate_capture/ byte-for-byte identical to the shared vendor manifest.
Keep the runtime standard-library-only and fail-soft on capture paths.
Never print diagnostics to MCP or notify stdout.
Never store API keys in Codex configuration; credentials come from process environment variables.
Run pytest, Ruff, the vendor digest comparison, and the public-plugin scanner before release.

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.

2mo ago First seen · 8 lines · 83 tokens per session scan A 0895c0d48813

Subscribe to this mod's changes

codex-substrate-memory AGENTS.md is an instructions file published in the GitHub repository Substrate-memory/codex-substrate-memory (0 stars, last pushed 2mo ago), licensed MIT. It adds 83 tokens to every session, about $0.0003 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.

Memory and context

codex-substrate-memory AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
codex-substrate-memory AGENTS.mdSubstrate-memory/codex-substrate-memory	Instructions file	0	2mo ago	MIT	A	83	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

codex-substrate-memory: Instructions file for Codex