What is cuda-metal AGENTS.md?

Repository instructions for CuMetal, a compiler and runtime that lets CUDA programs target Apple’s Metal graphics system on Apple Silicon computers.

Use them when working on the CUDA compiler, runtime compatibility layer, binary shim, cuBLAS or cuRAND behavior, tests, or AIR tooling.

They identify the project’s architecture, current engineering priorities, file structure, and rules for making safe changes.

How Lulzx/cuda-metal configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Lulzx/cuda-metal. 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/Lulzx/cuda-metal/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Lulzx/cuda-metal

Made for: Codex, OpenCode.

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README.md

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Per session 1,337 This file is loaded in full into every session.

When invoked 1,337 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	$0.01337	$0.01337
Opus 5.5	$0.00535	$0.00535
Sonnet 5.5	$0.00267	$0.00267
Haiku 4.5	$0.00134	$0.00134

Measured 1mo ago against content hash e61291703ab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cuda-metal 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 1mo 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 · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — CuMetal Development Guide

This file guides day-to-day implementation work in this repository.

Start with /Users/lulzx/work/cumetal/spec.md before architectural changes. If there is a conflict:

spec.md wins.
AGENTS.md is next.
README.md is status-oriented and may lag.

Project Identity

CuMetal is a CUDA compiler/runtime targeting Apple Metal on Apple Silicon.

Primary path: source recompilation with cumetalc.
Secondary path: opt-in binary-shim compatibility (libcuda.dylib alias and __cudaRegister* path) when CUMETAL_ENABLE_BINARY_SHIM=ON.

Current Focus

The repository is beyond the bootstrap phases. Focus implementation on:

Phase 4 correctness hardening (conformance, ABI compatibility, negative-path behavior).
Phase 4.5 shim coverage quality (cuBLAS/cuRAND behavior and tests).
Binary-shim hardening (additional fatbinary variants and registration parity) without regressing the source-first path.
AIR ABI tooling hardening where practical (air_inspect, air_validate), with explicit limitations tracked in docs/known-gaps.md.

Repository Structure

cumetal/
├── compiler/
│   ├── frontend/          # .cu frontend path
│   ├── ptx/               # PTX parser/lowering
│   ├── passes/            # LLVM transformation passes
│   ├── air_emitter/       # LLVM IR -> metallib emission
│   ├── air_validate/      # metallib validation
│   └── cumetalc/          # CLI
├── runtime/
│   ├── api/               # clean-room CUDA headers
│   ├── driver/            # Driver API shim
│   ├── rt/                # Runtime API shim
│   ├── registration/      # __cudaRegister* path (opt-in binary shim)
│   ├── error/             # per-thread error queue
│   ├── cache/             # metallib cache
│   └── metal_backend/     # Objective-C++ Metal boundary
├── tools/
│   ├── air_inspect/
│   ├── metal_library_archive_bridge/
│   ├── ptx_diff/
│   └── cumetal_bench/
├── tests/
│   ├── unit/
│   ├── functional/
│   ├── conformance/
│   ├── air_abi/
│   └── ptx_sweep/
├── docs/
│   ├── air-abi.md
│   └── known-gaps.md
├── spec.md                # canonical design spec
└── AGENTS.md              # this file

Read the full file on GitHub · 143 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.

1mo ago Changed · +20 lines · +260 tokens per session e61291703ab8
1mo ago Changed · +1 lines · +12 tokens per session 14cea6632fd1
2mo ago First seen · 122 lines · 1,065 tokens per session scan A e832cb53980c

Subscribe to this mod's changes

cuda-metal AGENTS.md is an instructions file published in the GitHub repository Lulzx/cuda-metal (215 stars, last pushed 2d ago), licensed Apache-2.0. It adds 1,337 tokens to every session, about $0.0053 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.

Apple Silicon GPU compiler cuda llvm macos

cuda-metal AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cuda-metal AGENTS.mdLulzx/cuda-metal	Instructions file	215	2d ago	Apache-2.0	A	1,337	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	2d ago	MIT	A	4,313	Codex, OpenCode

cuda-metal: Instructions file for Codex