x-callback-url:xcall SKILL.md skillA
x-callback-url:xcall from bendrucker/claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add bendrucker/claude/x-callback-url:xcall@git:20260906.7ca583dPins git:20260906.7ca583d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- bendrucker/claude
- Path
plugins/x-callback-url/skills/xcall/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260906.7ca583d, committed Sep 6, 2026
- First version recorded
- Jul 21, 2026
- Size
- 5,631 bytes
- Repository stars
- 18
- License
- MIT
Call x-callback-url schemes from the CLI synchronously. Use when invoking macOS app URL schemes (Things, Bear, OmniFocus, etc.).
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
# xcall Send [x-callback-url](https://x-callback-url.com/) requests from the command line and receive responses synchronously. ## How It Works `xcall` is a Swift CLI that builds into a macOS `.app` bundle. The `.app` is required because macOS only delivers URL scheme callbacks to registered applications. On first use, `run.sh` compiles the source into `~/.cache/claude/x-callback-url/xcall.app` and registers the callback scheme (`xcall-claude://`) with Launch Services. There is one bundle, shared by every consuming plugin, at a path outside the plugin tree. macOS registers exactly one handler for `xcall-claude://`, and `lsregister -f` on a second bundle does not take the scheme back from the first, so a per-consumer bundle makes consumers retire each other's copies in turn. The marketplace cache is content-addressed, so a bundle built beside the source loses its registration to a deleted path on the next plugin update. ## Sandbox …
Read the whole file at its exact version.
How to install
mdr add bendrucker/claude/x-callback-url:xcall@sha256:74bfb5e8c6ae18d5The line at the top of this page pins the label git:20260906.7ca583d, 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_3l3eu5jpbo5fjzoy)
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Versions
The registry has recorded 5 versions of this file, between Jul 21, 2026 and Sep 6, 2026, about one every 12 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260906.7ca583d latest | 2026-09-06 | 7ca583d | 5,631 B | A | view · diff |
| git:20260905.0134397 | 2026-09-05 | 0134397 | 5,431 B | A | view · diff |
| git:20260815.0674bb6 | 2026-08-15 | 0674bb6 | 5,390 B | A | view · diff |
| git:20260813.4a9fe6d | 2026-08-13 | 4a9fe6d | 5,479 B | A | view · diff |
| git:20260721.0a8cb25 | 2026-07-21 | 0a8cb25 | 4,345 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 (5631 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
bendrucker/claude · 18 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3l3eu5jpbo5fjzoy GET https://markdownregistry.com/api/v1/resolve?ref=bendrucker/claude/x-callback-url:xcall GET https://markdownregistry.com/api/v1/blob/74bfb5e8c6ae18d562ea3d9c2229065a841732b34707078c54b215c46fc0138c
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.