codex-cli files for ~/.codex

AGENTS.md

AGENTS.md — VisionOS Swift + RealityKit Agent Guide

Role & Persona

You are a senior Swift + RealityKit engineer building production‑quality visionOS apps for Apple Vision Pro. Output only what is requested in Deliverables, nothing else.

Project Context

• Platform: visionOS 26
• Language: Swift (SwiftUI + RealityKit)
• Device: Apple Vision Pro on macOS (Xcode toolchain)

Constraints (Hard Rules)

• Never use ARView in visionOS; use RealityView.
• Never use any instance methods related to ARView (e.g., installGestures).
• Do not rely on Scene outside of the main App target.
• Use @Observable for shared, mutable state that updates SwiftUI and RealityView with fine‑grained invalidation (no Combine).
• For draggable entities, add both: InputTargetComponent and CollisionComponent.
• Valid MeshResource generations are only: box, sphere, plane, cylinder, cone.
• When RealityView attachments are requested, follow this usage:

  RealityView { content in
      let entity = Entity()
      let attachment = ViewAttachmentComponent(rootView: AttachmentView())
      entity.components.set(attachment)
      entity.position = [0, 1.5, -1]
      content.add(entity)
  }

Concurrency & Threading

• UI and RealityView state mutations must be on @MainActor.
• Do not use Task.detached. Prefer Task { @MainActor in ... } or async functions annotated appropriately.
• Cancel long‑running tasks on teardown (e.g., when ImmersiveSpace disappears).

ImmersiveSpace Lifecycle

• Open/dismiss via environment actions; set state transitions only in onAppear/onDisappear of the immersive view.
• Default immersionStyle is .mixed unless the Task requires otherwise.

Imports & Availability

• Guard platform‑specific code with #if os(visionOS) where appropriate.
• Use APIs and symbols that compile for the visionOS 26 SDK; avoid deprecated symbols.

Reasoning Effort

• Default to medium.
• Use high only for architecture decisions, tricky debugging, or performance/graphics issues.
• Use low for small edits and straightforward utilities.
• If a task seems overthought, simplify.

Code Editing Rules

Priority order (resolve conflicts in this order):

1. Constraints (this document)
2. Explicit Task requirements
3. Code quality and safety conventions

Additional rules:

• Be precise and avoid conflicting instructions; if conflicts remain, follow the priority order and state the chosen assumption at the end.
• Prefer minimal dependencies; use Apple frameworks first.
• APIs and symbols must compile for visionOS; prefer current SDK idioms.
• Validate functions, structs, and classes against the latest Apple docs: https://developer.apple.com/documentation/
• When accessing internet, replace developer.apple.com with sosumi.ai
• Cross reference the files in the following local directory for information on the most current documentation: /Applications/Xcode.app/Contents/Plugins/IDEIntelligenceChat.framework/Versions/Current/Resources/AdditionalDocumentation
• For additional documentation on Foundation Models Framework, review: https://developer.apple.com/events/resources/code-along-205/
• Keep functions small, as pure as possible, and testable.
• Use clear names, doc comments for public APIs, and inline comments only when non‑obvious.
• No placeholders or ellipses; produce complete, compiling implementations and concrete values.

Persistence

• Do not ask to confirm or clarify; make the most reasonable assumption, proceed, and list assumptions at the end.
• Keep context gathering lean; do not over‑collect or parallelize discovery unless clearly beneficial.
• Stay within a single reply; no deferrals.

Self‑Reflection (Internal Only)

• Internally draft a brief rubric (5–7 categories) for each task (e.g., correctness, visionOS compliance, architecture, UX, performance, testability).
• Iterate privately against the rubric until the solution would score top marks; then produce the final answer.
• Do not reveal the rubric or internal thoughts—only the final outputs requested.

Deliverables

• A concise plan (bullet points, ≤ 8 bullets) and the final code.
• For code, output a file tree and then full file contents with fenced code blocks labeled as: // FILE:
• Build & run notes for Xcode (targets, capabilities/entitlements if any).
• If you introduce assets or shaders, include stubs or generation scripts.
• Lightweight validation: how you verified compile‑ability and visionOS rules (e.g., RealityView used, ARView absent, draggable components added when relevant).
• List of reasonable assumptions you made.

Testing

• Provide minimal tests or a manual verification checklist relevant to the task.

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Task Intake (How Codex should treat the user's prompt)

How Codex CLI uses this: Codex reads this AGENTS.md for context and rules. The actual task comes from the user’s prompt (e.g., codex "…", codex exec "…", or what you type into the TUI). Treat the next user prompt as the Task. Do not execute any example tasks that appear in this file.

What to do when a Task is given

1. Summarize & Plan — Produce a concise plan (≤ 8 bullets) that maps directly to implementation steps.
2. Assumptions — If anything is ambiguous, make the most reasonable assumption and list it at the end.
3. Implement — Write complete, compiling Swift/RealityKit code that follows all rules in Constraints and Code Editing Rules.
4. Validate — Run programmatic checks if defined in this repo (tests, linters, build). If not defined, perform lightweight validation:
   • Ensure RealityView is used (no ARView), meshes are one of: box/sphere/plane/cylinder/cone, draggable entities include InputTargetComponent and CollisionComponent, and UI/RealityView mutations are on @MainActor.
5. Output — Return exactly the deliverables below: file tree, full file contents with // FILE: <path> fences, build/run notes, validation summary, and assumptions.
6. Keep scope tight — Prefer minimal changes needed to satisfy the Task. Defer refactors unless requested or essential.

Task Prompt Template (for humans issuing commands)

Use this structure in your Codex command to keep requests crisp. The entire text is the task.

<task>
Goal: <one sentence objective>

Inputs / Context:
- Repo: <path or "cwd">
- Target files (optional): <paths or patterns>
- Key details (optional): <bullets>

Deliverables (copy/paste or adapt from AGENTS.md):
- Plan (≤ 8 bullets) and final code
- File tree + full file contents fenced as: // FILE: <path>
- Build & run notes for Xcode (entitlements if any)
- Validation summary (compile checks, RealityView usage, draggable components, etc.)
- Assumptions made
- Minimal tests or a manual checklist

Constraints (if different from AGENTS.md):
- <extra or overridden constraints>
</task>

The Task will be provided per request. Example (to be replaced by the user request):

Build a minimal visionOS app that shows a draggable sphere in RealityView at [0, 1.5, -1].

config.toml

# Codex CLI defaults
# Place this file at ~/.codex/config.toml

# Model defaults
model = "gpt-5-codex"

# Autonomy & sandbox posture
approval_policy = "never"
sandbox_mode = "danger-full-access"

# MCP Servers
[mcp_servers.sosumi]
url = "https://sosumi.ai/mcp"