copilot-sdk-worker-only SKILL.md skillA
copilot-sdk-worker-only from chrisreddington/flight-school is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add chrisreddington/flight-school/copilot-sdk-worker-only@git:20260524.78cd692Pins git:20260524.78cd692 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- chrisreddington/flight-school
- Path
.github/skills/copilot-sdk-worker-only/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260524.78cd692, committed May 24, 2026
- Size
- 7,890 bytes
- Repository stars
- 30
- License
- MIT
Use whenever you are writing, reviewing, or refactoring any code that touches the GitHub Copilot SDK (`@github/copilot-sdk`). Enforces the non-negotiable architectural rule that **all** SDK execution — chat, coach, lightweight coach, evaluation, hints, quiz, suggestions, focus generation, README generation, anything that calls `createSession` or `sendAndWait` — happens inside the Copilot Worker process and never inside Next.js (Web/API). Trigger phrases: "Copilot SDK…
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
# Copilot SDK is worker-only > **Web/API is forbidden from importing `@github/copilot-sdk` or any > module that creates a Copilot session. AI execution lives in the > worker. Always.** This is the most important architectural invariant in Flight School. It is not a guideline. It is a contract. ## Why this rule exists The Web/API tier serves authenticated user requests. The Copilot SDK spawns Copilot CLI subprocesses, opens MCP connections, and holds long-lived per-user state. Mixing those concerns inside Next.js produces: - **Tenant leakage.** A shared CopilotClient at module scope inevitably gets reused across users; the SDK's per-session token is the only safe barrier and it is easy to bypass accidentally. - **Cold-start tax on every request.** SDK startup is heavyweight; the worker amortises it across a pool. Web/API would pay the cost per request. - **No back-pressure.** The worker bounds concurrency per user and per process; Web/API has no equivalent and would happily spawn N CLI processes for N concurrent requests. - **Crash blast radius.** An SDK process crash inside Next.js kills the whole web server. Inside the worker it kills a single job. …
Read the whole file at its exact version.
How to install
mdr add chrisreddington/flight-school/copilot-sdk-worker-only@sha256:169189a43baf6aacThe line at the top of this page pins the label git:20260524.78cd692, 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_7rt3uyw4zxwdve6k)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 24, 2026.
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 (7890 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
chrisreddington/flight-school · 30 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7rt3uyw4zxwdve6k GET https://markdownregistry.com/api/v1/resolve?ref=chrisreddington/flight-school/copilot-sdk-worker-only GET https://markdownregistry.com/api/v1/blob/169189a43baf6aac71601c2395bf0bf2f46943c54435ca638c39a4b2162163fd
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.