Mounts an agent against this tree's build in an isolated home and a fresh fixture, then measures it, probes it, or adds it, before any release publishes that build.
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
# Playgrounds
A playground runs one agent against this tree's build, in an isolated home and a fresh copy of a fixture, so a session measures exactly what a release would publish for that agent, before the release exists. Two scripts drive it: `scripts/playground/agents.sh` for every agent but Claude Code, and `scripts/playground/mount.sh` for Claude Code. Their helpers live in `tools/playground/`.
## When invoked
1. **Pick the agent** from the arguments. Without one, list the supported agents as a numbered list and ask which to measure, probe, or add.
2. **Mount it.** When its CLI is missing, give the user its install command from "Supported agents", step by step, and wait.
3. **Run what needs no session yourself:** the mount, the report, the server switch, and headless checks. For everything that needs the user's session, hand over the exact steps: the command to start it, what to type, what to approve, and when to stop.
4. **Read the verdict** from the report, and the agent's transcript in the isolated home when the report alone does not explain it.
5. **Report back** each measurement's verdict, with its evidence.
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## Ground rules
…
The line at the top of this page pins the label git:20261102.0ad572c, 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.
GET https://markdownregistry.com/api/v1/artifacts/art_ka2rtmnlkqjpv5h2
GET https://markdownregistry.com/api/v1/resolve?ref=wellwelwel/lagune/playground
GET https://markdownregistry.com/api/v1/blob/bff31124a5696b26aa1c2f8920f5fa6b32d53c94000db3baebb4138ad133c19b
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.
wellwelwel/lagune · .claude/skills/architecture/SKILL.md · Authoritative record of Lagune's architecture decisions, covering the three owners, what ships, the engine, the skills…
wellwelwel/lagune · .claude/skills/blind-review/SKILL.md · Maps what a branch or the work in progress changes in behavior, before and after, from the code diff alone. Commit…
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wellwelwel/lagune · .claude/skills/dashboard/SKILL.md · Authoritative reference for the Lagune dashboard, a live view of a project's .lagune/ chain with a locked-down local…
wellwelwel/lagune · .claude/skills/ingest/SKILL.md · Use before reading any .txt file, whatever its name, and whenever a task builds on GitIngest digests. Checks whether a…
wellwelwel/lagune · .claude/skills/mcp-catalog/SKILL.md · Find, review, and add MCP servers to the reviewed catalog that lagune.ai serves to Lagune Code. Use when asked to look…
wellwelwel/lagune · .claude/skills/refine/SKILL.md · Confronts a scope with the engineering, testing, and writer skills, each where it applies, and with the architecture a…
wellwelwel/lagune · .claude/skills/simulate/SKILL.md · How to simulate a Lagune command end to end so the user sees both the process and the results in chat. Use when the…
wellwelwel/lagune · .claude/skills/specialize/SKILL.md · Author a new built-in Lagune specialization inside the Lagune source, not a project's own catalog. Use when adding or…
wellwelwel/lagune · .claude/skills/testing/SKILL.md · Authoritative reference for deciding whether a test should exist and what it must assert. Use before writing or…
wellwelwel/lagune · .claude/skills/ui/SKILL.md · Design engineering principles for making interfaces feel polished. Use when building UI, reviewing frontend code, or…
sandbaseai/sandbase-skills · marketing/playground/SKILL.md · Create, implement, or review playground work with format, accessibility, performance, and visual-verification controls…
