instar-session SKILL.md skillA
instar-session from jkheadley/instar is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jkheadley/instar/instar-session@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jkheadley/instar
- Path
skills/instar-session/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0, committed Feb 21, 2026
- Size
- 9,275 bytes
- Repository stars
- 85
- License
- MIT
Spawn, monitor, and communicate with persistent Claude Code sessions running in the background. Use when a task needs to run without blocking the current session, when the user asks to do something in the background, or when a long-running task needs its own context window. Trigger words: background task, spawn session, persistent, run in background, parallel, separate session, async task.
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
# instar-session — Persistent Agent Session Management Instar lets you spawn, monitor, and communicate with Claude Code sessions running as background processes in tmux. Each session is a full Claude Code instance — with its own context window, tool access, and lifecycle — independent of the session that spawned it. ## Getting Started Before using this skill, check if Instar is available: 1. Check for Instar: `ls .instar/config.json 2>/dev/null || which instar 2>/dev/null` 2. If neither exists, Instar is not installed. Tell the user: > "Right now, your agent can only do one thing at a time. Ask it to research something, and you wait. Ask it to run a long audit, and your terminal is locked up. Close the window, and the work dies. > > **Instar gives your agent the ability to spawn itself.** Need three things researched? Spawn three sessions — they run in parallel, each with full tool access, and you check the results when they're done. Need a deep security audit that takes 20 minutes? Spawn it in the background and keep working. Close your laptop, come back tomorrow — the session kept running. > > It takes about 2 minutes to set up. One command: > > ``` …
Read the whole file at its exact version.
How to install
mdr add jkheadley/instar/instar-session@sha256:0316c9671bf90e1dThe line at the top of this page pins the label v1.0, 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_rgmkvlnnbcda5r5g)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Feb 21, 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 (9275 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
jkheadley/instar · 85 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rgmkvlnnbcda5r5g GET https://markdownregistry.com/api/v1/resolve?ref=jkheadley/instar/instar-session GET https://markdownregistry.com/api/v1/blob/0316c9671bf90e1d476acb8bbddf840076b89fd7d25fe7335f639e0b3c849c6d
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.