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cortex: Instructions file for Codex

AGENTS.md

cortex AGENTS.md is an instructions file for Codex, OpenCode from envibagus/cortex. It costs 1,464 tokens per session, scanned B, original, MIT.

Developer guidance for Cortex, a native macOS app built with SwiftUI that shows and manages a local collection of AI coding tools, sessions, costs, skills, agents, servers, hooks, memory, repositories, and ports.

In plain words
What is it for?
Use it when adding or changing Cortex features, rebuilding the Xcode project, compiling the macOS app, or working within its architecture and conventions.
Why use it?
It explains how the app is organized and built, helping agents avoid breaking generated project files, platform requirements, or shared application state.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: reads .claude/ paths; mentions Claude Code.

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

not rated 7repo 22d ago B scan 1,464 tokens original MIT
View source ↗ envibagus/cortex
Reuse

Borrowing it

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

Made for: Codex, OpenCode.

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Per session 1,464 This file is loaded in full into every session.
When invoked 1,464 The same file — it is already loaded in full.
Security scan B 1 finding. 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 $0.01464 $0.01464
Opus 5.5 $0.00586 $0.00586
Sonnet 5.5 $0.00293 $0.00293
Haiku 4.5 $0.00146 $0.00146

Measured 2mo ago against content hash 0e32072d8bca, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

cortex AGENTS.md scanned grade B with 1 finding 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

which installs reversible Claude Code hooks in `~/.claude/settings.json`. Do not add
AGENTS.md · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cortex - agent & contributor guide

Context for AI coding agents (and humans) working in this repo. Read this before making changes. Cortex is a native SwiftUI macOS app: a control center for your local AI stack (Claude Code sessions, costs, skills, agents, MCP servers, hooks, memory, repos, ports).

Build & run

xcodegen generate   # regenerate Cortex.xcodeproj from project.yml (run after ADDING or REMOVING a .swift file)
xcodebuild -project Cortex.xcodeproj -scheme Cortex -configuration Debug -destination 'platform=macOS' build
open ~/Library/Developer/Xcode/DerivedData/Cortex-*/Build/Products/Debug/Cortex.app

Or open Cortex.xcodeproj in Xcode and Run. The .xcodeproj is generated and gitignored; project.yml is the source of truth. Requirements: macOS 15+, Xcode 16+. The UI uses macOS 26 Liquid Glass APIs behind availability checks, so the full build wants the macOS 26 SDK / Xcode 26; older Xcode builds the rest with pre-26 fallbacks. Dependency-light: SwiftUI + Swift Charts + MarkdownUI + SwiftDraw only.

Architecture map

  • Cortex/App - AppModel is the single @Observable source of truth (current route, every store, settings, and the refresh orchestration). ContentView is the NavigationSplitView shell + the cmd-K command palette + toasts. Navigation holds the Route enum and sidebar sections. CortexApp owns window config + menu-bar commands.
  • Cortex/Services (all read REAL data, locally, read-only):
    • SessionStore parses ~/.claude/projects/**/*.jsonl into sessions + day buckets.
    • ConfigScanner discovers skills/agents/commands/rules/MCP/hooks/memory/instructions from ~/.claude and the configured scan roots.
    • RepoService (git + gh), PortService (lsof), CostService (pricing), UsageService (live limits), SummaryService (on-device summaries), HygieneEngine (health/security scores), LibraryStore (favorites/collections).
    • ChatService is the Assistant: drives the claude (or agy) CLI as a transport.
    • Shell runs subprocesses and resolves binaries (see gotchas).
  • Cortex/DesignSystem - Theme, Components (Card, GlassSegmentedControl, CortexGroupBoxStyle, Pill, hoverHighlight, PageScaffold, FlowLayout), Charts, MarkdownText.
  • Cortex/Features - one file per route (ReadoutView, AssistantView, SessionsView, ...).
  • Cortex/Models - shared value types (ClaudeSession, ConfigItem, ChatMessage, ...).

Read the full file on GitHub · 92 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 · 92 lines · 1,464 tokens per session scan B 0e32072d8bca

Subscribe to this mod's changes

cortex AGENTS.md is an instructions file published in the GitHub repository envibagus/cortex (7 stars, last pushed 22d ago), licensed MIT. It adds 1,464 tokens to every session, about $0.0059 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Codeaidashboarddeveloper-toolsmacosswiftui
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