mac-runtime SKILL.md skillA
mac-runtime from calebnewtonusc/chewbacca is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add calebnewtonusc/chewbacca/mac-runtime@git:20260904.ee0eb1bPins git:20260904.ee0eb1b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- calebnewtonusc/chewbacca
- Path
skills/mac-runtime/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260904.ee0eb1b, committed Sep 4, 2026
- First version recorded
- Sep 4, 2026
- Size
- 3,531 bytes
- Repository stars
- 9
- License
- MIT
Run a multi-step task on the Mac as a formal plan that is type-checked, executed, verified, and logged - instead of improvising bash step by step. Use for any task with more than two or three steps, anything that ends in an irreversible action (send, pay, post, submit), or anything the user will want to debug afterward. This is Chewbacca's agent runtime.
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
# The Chewbacca runtime: plan, execute, verify, log For anything longer than a couple of steps, do not freehand a sequence of commands. Compile the request into one formal plan, check it, run it, and read the trace. The reason is arithmetic, not style. Twenty improvised steps at 95% reliability each is a 36% success rate (see `docs/BENCHMARKS.md`). A checked plan that stops at the first failure and gates every irreversible action does not compound errors that way. This is the Genie / executable-semantic-parser idea (Campagna, Xu, Lam; Liang): compile intent into a typed, checkable representation that runs or errors cleanly, rather than letting the model improvise. ## The grammar `data/grammar.json` defines the command space: `stream => query* => action*`. - **stream** - when it runs: `now`, `every`, `on_text`, `on_file`, `on_calendar` - **query** - reads, no side effects: `texts`, `screen`, `web`, `app_data`, `file` - **action** - side effects: `click`, `type`, `web_click`, `web_fill`, `remind`, `calendar`, `send_text`, `send_email`, `run_shell` Every parameter is typed. Every irreversible action carries `confirm: true` in its …
Read the whole file at its exact version.
How to install
mdr add calebnewtonusc/chewbacca/mac-runtime@sha256:8dc1bee64b0d376eThe line at the top of this page pins the label git:20260904.ee0eb1b, 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_4nkihsy3difnc6fe)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Sep 4, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260904.ee0eb1b latest | 2026-09-04 | ee0eb1b | 3,531 B | A | view · diff |
| git:20260904.25a1d94 | 2026-09-04 | 25a1d94 | 3,512 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 (3531 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
calebnewtonusc/chewbacca · 9 stars · license MIT · pushed 2026-10-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4nkihsy3difnc6fe GET https://markdownregistry.com/api/v1/resolve?ref=calebnewtonusc/chewbacca/mac-runtime GET https://markdownregistry.com/api/v1/blob/8dc1bee64b0d376e7eb79c6ddd555a06a2bdc12cc718e55244864c51b21eb2af
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.