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grain: Instructions file for Codex

AGENTS.md

grain AGENTS.md is an instructions file for Codex, OpenCode from grainsocial/grain. It costs 3,097 tokens per session, scanned A, original, MIT.

Project instructions for an AT Protocol application built with hatk, covering its folders, generated types, server code, frontend, tests, and project-specific commands.

In plain words
What is it for?
Use them when changing feeds, server handlers, frontend routes, lexicon schemas, generated types, tests, seeds, or project configuration.
Why use it?
They give a coding agent the context needed to navigate the repository and avoid editing generated files or using the wrong imports.

Instructions file for CodexOpenCode

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

This is grainsocial/grain's own configuration. It tells Codex and OpenCode how to work on grain 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 grain configures →

not rated 59repo +1 changed 2d ago A scan 3,097 tokens original MIT
View source ↗ grainsocial/grain grain.social
Reuse

Borrowing it

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

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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/grainsocial/grain/agents-md"><img src="https://agentmods.dev/badge/instructions/grainsocial/grain/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 grain AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/grainsocial/grain/agents-md"><img src="https://agentmods.dev/badge/instructions/grainsocial/grain/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,097 This file is loaded in full into every session.
When invoked 3,097 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 $0.03097 $0.03097
Opus 5.5 $0.01239 $0.01239
Sonnet 5.5 $0.00619 $0.00619
Haiku 4.5 $0.00310 $0.00310

Measured 2d ago against content hash 0a85c46d7d2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

grain 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 2d 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 · 288 lines

How it starts

The opening of the file, as written. The whole thing — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.

hatk project

This is an AT Protocol application built with hatk. Read the project's lexicons in lexicons/ to understand the data model. Types are generated from lexicons into hatk.generated.ts — never edit this file directly.

Project structure

Directory Purpose
lexicons/ AT Protocol lexicon schemas (JSON). Defines collections and XRPC methods
server/ All server-side code: feeds, XRPC handlers, hooks, labels, OG routes, setup scripts
app/ SvelteKit frontend (routes, components, styles)
seeds/ Test data seeding scripts for local development
test/ Test files (vitest). Run with vp test
public/ Static files served at the root

Key files

  • hatk.config.ts — project configuration (see defineConfig for type info)
  • hatk.generated.ts — auto-generated server types and helpers. Regenerate with hatk generate types
  • hatk.generated.client.ts — auto-generated client-safe types and callXrpc. Never import hatk.generated.ts from frontend code

The $hatk alias

Server files in server/ import from $hatk:

import { defineFeed, views, type Status } from "$hatk";

SvelteKit routes and components import from $hatk/client:

import { callXrpc, getViewer } from "$hatk/client";

$hatk resolves to hatk.generated.ts and $hatk/client to hatk.generated.client.ts. The Vite plugin handles this in dev/build. In tests and production, a Node.js module resolve hook handles it.

Commands

Run npx hatk --help for the full list of commands.

Use npx hatk generate to scaffold new feeds, xrpc handlers, labels, and lexicons rather than creating files manually. These generate files with the correct imports.

Read the full file on GitHub · 288 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. 2d ago Changed · +11 lines · +131 tokens per session 0a85c46d7d2d
  2. 7d ago Changed · +9 lines · +146 tokens per session d61956fe10d3
  3. 2mo ago Changed · +1 lines · +5 tokens per session 9a73c34a68c0
  4. 2mo ago Changed · +17 lines · +270 tokens per session c54280c75fe0
  5. 2mo ago First seen · 250 lines · 2,545 tokens per session scan A 352b4caa1c09

Subscribe to this mod's changes

grain AGENTS.md is an instructions file published in the GitHub repository grainsocial/grain (59 stars, last pushed yesterday), licensed MIT. It adds 3,097 tokens to every session, about $0.0124 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.

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