subagent-engineering SKILL.md skillA
subagent-engineering from xobotyi/cc-foundry is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add xobotyi/cc-foundry/subagent-engineering@git:20261029.ffe0c27Pins git:20261029.ffe0c27 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- xobotyi/cc-foundry
- Path
plugins/ai-helpers/skills/subagent-engineering/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261029.ffe0c27, committed Oct 29, 2026
- First version recorded
- Aug 17, 2026
- Size
- 12,376 bytes
- Repository stars
- 23
- License
- MIT
Design and maintain Claude Code subagents: the delegation decision, the frontmatter that governs a run, and the system prompt the agent wakes up with.
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
**A subagent is a separate context with its own system prompt.** It inherits none of the caller's conversation, and everything it reads is discarded when it stops — only what it returns survives. Isolation is the reason to pay for one, and the return value is the entire product. <prerequisite> A subagent definition is a system prompt. Invoke `prompt-engineering` for the wording, instruction budget, and timelessness rules that govern every line written here. This skill covers only what is specific to the subagent artifact — the delegation decision, the frontmatter, and the prompt the agent wakes up with. </prerequisite> ## Delegate only where the isolation pays - **Delegate work whose output is far larger than its conclusion** — a wide search, a long file, a verbose test run. The caller pays for the summary instead of the transcript. - **Delegate to restrict, too.** A tool allowlist or a cheaper model binds the whole run, which no instruction inside the main conversation achieves. - **Keep the work in the main conversation when it needs back-and-forth**, when several phases share the same context, …
Read the whole file at its exact version.
How to install
mdr add xobotyi/cc-foundry/subagent-engineering@sha256:3110795dbc0efd4fThe line at the top of this page pins the label git:20261029.ffe0c27, 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_udbsdjm3p2hwnpu2)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 17, 2026 and Oct 29, 2026, about one every 18 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261029.ffe0c27 latest | 2026-10-29 | ffe0c27 | 12,376 B | A | view · diff |
| git:20260828.330cbc2 | 2026-08-28 | 330cbc2 | 11,909 B | A | view · diff |
| git:20260828.2e38d3c | 2026-08-28 | 2e38d3c | 14,547 B | A | view · diff |
| git:20260823.ef9cec4 | 2026-08-23 | ef9cec4 | 14,609 B | A | view · diff |
| git:20260817.c823ba7 | 2026-08-17 | c823ba7 | 11,579 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 (12376 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
xobotyi/cc-foundry · 23 stars · license MIT · pushed 2026-10-31 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_udbsdjm3p2hwnpu2 GET https://markdownregistry.com/api/v1/resolve?ref=xobotyi/cc-foundry/subagent-engineering GET https://markdownregistry.com/api/v1/blob/3110795dbc0efd4f4b027d6387d3b70d17d73dc9fe4310cb44a633209ae55f6d
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.