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/forbiddenlink/mythos/agents-mdgit clone --depth 1 https://github.com/forbiddenlink/mythosWhat 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 | $0.01710 | $0.01710 |
| Opus 5 | $0.00855 | $0.00855 |
| Sonnet 5 | $0.00342 | $0.00342 |
| Haiku 4.5 | $0.00171 | $0.00171 |
Grade A, and why
mythos 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.
How it starts
The opening of the file, as written. The whole thing — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to WARP (warp.dev) when working with code in this repository.
Design system: before generating any UI, read apps/web/public/design-system.txt (machine-readable token + component contract). Token SoT = apps/web/src/app/globals.css; philosophy = .impeccable.md.
Project Overview
Mythos Atlas is an interactive mythology encyclopedia. It's a pnpm + Turborepo monorepo with two apps:
apps/web— Next.js 16 (App Router) + React 19 frontend. Serves a GraphQL API from a Next.js route handler backed by static JSON data files. This is the primary app where most development happens.apps/api— Rust (Axum + async-graphql + SQLx) backend targeting PostgreSQL. This is a secondary/optional backend that mirrors the GraphQL API.
In practice, the web app is self-contained: its /api/graphql route handler reads directly from JSON files in src/data/, so the Rust API is not required for local development.
Commands
All commands are run from the monorepo root unless noted otherwise.
Setup
pnpm install
cp apps/web/.env.example apps/web/.env.local # then add ANTHROPIC_API_KEY / Upstash for Oracle
Development
pnpm dev # starts all apps via Turborepo (web on :3000)
pnpm --filter web dev # start only the web app
Build
pnpm build # build all apps
pnpm --filter web build # build only web (uses --webpack flag for next-pwa compatibility)
Lint & Typecheck
pnpm lint # ESLint across all apps
pnpm --filter web exec tsc --noEmit # TypeScript type check (web)
Testing — Unit (Vitest)
Run from root or scoped to web:
pnpm --filter web test # run all unit tests once
pnpm --filter web test:watch # watch mode
pnpm --filter web test:coverage # with coverage (thresholds: 80% lines/functions/statements, 70% branches)
Run a single test file:
pnpm --filter web exec vitest run src/__tests__/lib/search.test.ts
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.
- 2d ago First seen · 161 lines · 1,710 tokens per session scan A af666d96958d
mythos AGENTS.md is an instructions file published in the GitHub repository forbiddenlink/mythos (2 stars, last pushed 3d ago), licensed MIT. It adds 1,710 tokens to every session, about $0.0086 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 2026-08-31.
Other instructions, from other repositories
data-table-filters CLAUDE.md
Instructions for openstatusHQ/data-table-filters, covering claude.md, project overview, monorepo structure (pnpm + turborepo), key commands and database.
www-sacred AGENTS.md
Instructions for internet-development/www-sacred, covering agents.md, what this repo is, repo map, conventions and the fonts menu previews.
karakeep CLAUDE.md
Claude Code instructions for karakeep-app/karakeep, a project described as: A self-hostable bookmark-everything app (links, notes and images) with AI-based automatic tagging and full text search.
Codex-Skills AGENTS.md
Instructions for TheGoat395/Codex-Skills, covering repository operating notes, required checks, evidence rules and change hygiene.
souls-directory CLAUDE.md
Instructions for thedaviddias/souls-directory, covering claude.md — project context for ai assistants, project overview, tech stack, critical rules and database is convex.
agentgram CLAUDE.md
Instructions for agentgram/agentgram, covering claude.md — agentgram development guide, project overview, tech stack, monorepo structure and core architecture patterns.