codex-mirror SKILL.md skillA
codex-mirror from tonydzi/second-brain-starter-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tonydzi/second-brain-starter-kit/codex-mirror@git:20261020.402f6b7Pins git:20261020.402f6b7 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tonydzi/second-brain-starter-kit
- Path
skills/codex-mirror/SKILL.md- Versions recorded
- 9
- Latest version
- git:20261020.402f6b7, committed Oct 20, 2026
- First version recorded
- Aug 14, 2026
- Size
- 6,713 bytes
- Repository stars
- 14
- License
- MIT
Rebuild the canon mirror for a second coding agent (AGENTS.md) after a rules-file version bump: show the changelog delta, write in only the new rules, then enforce the size cap, version stamp, structural anchors, a copy into the shared folder and the linter run. Triggers: "/codex-mirror", "update the codex mirror", "AGENTS.md is stale".
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
# codex-mirror — the shared-canon mirror for Codex The pain (found 2026-07-25): CLAUDE.md went through a v2 revision on 07-22, while `~/.codex/AGENTS.md` quietly stayed on its June version — **Codex worked off stale rules for a month**, and the drift checker of that era was blind to the very same revision. The cure: the mirror is **version-based** (we compare versions, not shape), a watchdog shouts at night, and this skill is the cheap "rebuild" button so that the shouting doesn't turn into evening manual labour. Roles (AK-47): the **script** moves the bytes and checks everything; **I** only write the text of the new rules. Do not retype the file by hand and do not eyeball the byte count. Engine: `python %USERPROFILE%\.claude\scripts\codex_mirror.py <check|backup|stamp|publish|selftest>` ## Step 0 — RECALL + the frame - Memory: [[canon-versioning-and-drift-watchdog]] (the class "the watchdog died silently together with the thing it watched"), [[codex-cli-install]], [[any-llm-vault-actor]], [[claude-md-compression-contract]]. - The mirror = a **canon edit** → only the owner's machine in a live session; followers are receive-only ([[machine-governance-leader-follower]]). …
Read the whole file at its exact version.
How to install
mdr add tonydzi/second-brain-starter-kit/codex-mirror@sha256:3a59a0622c8ee299The line at the top of this page pins the label git:20261020.402f6b7, 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.
[](https://markdownregistry.com/a/art_shqnhaoi5ocmynhv)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 9 versions of this file, between Aug 14, 2026 and Oct 20, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261020.402f6b7 latest | 2026-10-20 | 402f6b7 | 6,713 B | A | view · diff |
| git:20261007.cd6c208 | 2026-10-07 | cd6c208 | 6,719 B | A | view · diff |
| git:20261003.a2d662f | 2026-10-03 | a2d662f | 6,720 B | A | view · diff |
| v1.0.0 | 2026-09-24 | 2784cb2 | 9,386 B | A | view · diff |
| git:20260908.2ec1bf8 | 2026-09-08 | 2ec1bf8 | 6,725 B | A | view · diff |
| git:20260814.5a89dd6 | 2026-08-14 | 5a89dd6 | 6,387 B | A | view · diff |
| git:20260814.06fa906 | 2026-08-14 | 06fa906 | 8,229 B | A | view · diff |
| git:20260814.5023d8c | 2026-08-14 | 5023d8c | 7,534 B | A | view · diff |
| git:20260814.44e61cf | 2026-08-14 | 44e61cf | 8,061 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6713 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
tonydzi/second-brain-starter-kit · 14 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_shqnhaoi5ocmynhv GET https://markdownregistry.com/api/v1/resolve?ref=tonydzi/second-brain-starter-kit/codex-mirror GET https://markdownregistry.com/api/v1/blob/3a59a0622c8ee2995cefc4738a233b19201e428f792ae5dd169340e8b8a9aca3
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: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.