AGENTS.mdA

AGENTS.md from marcodotio/ycode is an AGENTS.md file: the standing instructions coding agents read in that repo.

Install it, pinned
mdr add marcodotio/ycode/AGENTS.md@git:20261103.d70e2be

Pins git:20261103.d70e2be in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 14 of 14 checks passed
Kind
AGENTS.md file
Repository
marcodotio/ycode
Path
AGENTS.md
Versions recorded
2
Latest version
git:20261103.d70e2be, committed Nov 3, 2026
First version recorded
Oct 24, 2026
Size
7,600 bytes
Repository stars
10
License
MIT

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Ycode — clean-room reimplementation of the Xcode IDE

Ycode is an independent IDE for Apple platforms. It matches Xcode's observable
behavior and file formats so that real projects open, build, and save
correctly. **It contains no Apple code.** We study Xcode only to learn *what*
it does. Ycode code comes from our own specs.

Reference target: Xcode 27.1 (27A9269). A copy of it, Ghidra 12.1.4 with the
ghidra-mcp bridge, and the simulator IPSW live **outside this repository**, in
the machine's reverse-engineering tools folder (the exact path is in local,
untracked notes). Below, "the reference tools" means that folder. The
`CLAUDE.md`/`AGENTS.md` inside ghidra-mcp belong to that third-party repo.
They are not rules for this project.

## The clean-room protocol (mandatory)

There are two rooms. Information goes from the dirty room to the clean room
only in written specs.

| Room | Where | May read Xcode binaries? | Produces |
|---|---|---|---|
| Dirty (analysis) | `research/`, `research/dirty/` (git-ignored) | Yes | Observations, then specs |
| Spec boundary | `specs/` | — | Prose, tables, grammars, interface descriptions |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add marcodotio/ycode/AGENTS.md@sha256:5af2e4d3d34ee81e

The line at the top of this page pins the label git:20261103.d70e2be, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_egowgbqnyujvk5kp.svg)](https://markdownregistry.com/a/art_egowgbqnyujvk5kp)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Oct 24, 2026 and Nov 3, 2026, about one every 10 days.

versioncommittedcommitsizeaudit
git:20261103.d70e2be latest2026-11-03 d70e2be 7,600 BA view · diff
git:20261024.e83f8c82026-10-24 e83f8c8 7,243 BA view

Audit of the latest version

A  14 of 14 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Size between 200 bytes and 200 KB (7600 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

marcodotio/ycode · 10 stars · license MIT · pushed 2026-11-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_egowgbqnyujvk5kp
GET https://markdownregistry.com/api/v1/resolve?ref=marcodotio/ycode/AGENTS.md
GET https://markdownregistry.com/api/v1/blob/5af2e4d3d34ee81e78b6c888c4347f27bf9864efa70ae89a67e2ddf0a1511a0b

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: how to write a good AGENTS.md · AGENTS.md vs CLAUDE.md · which agent file does what.

More from marcodotio/ycode

CLAUDE.md CLAUDE.md file
marcodotio/ycode · CLAUDE.md
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