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my-second-brain-playground

v0.16.7

A local playground for building My Second Brain skills one vertical slice at a time.

CodexClaude Code9 Skills

By Nathan Vale0 GitHub starsUpdated 3 hours ago

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
9 skill or MCP entries
Source updated
Sep 30, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install my-second-brain-playground for Codex and Claude Code

Installs for the current user
codex plugin marketplace add IchenDEV/agent-plugin-mkt
codex plugin marketplace upgrade agent-plugin-marketplace
codex plugin add my-second-brain-playground@agent-plugin-marketplace

Paste and run these commands in a terminal with Codex. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/nathanvale/dotfiles-private

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is config/agents/plugins/my-second-brain-playground/.

Plugin files

config/agents/plugins/my-second-brain-playground/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/beads-workflow/SKILL.md
├── skills/cli-design/SKILL.md
├── skills/evaluate-slice/SKILL.md
├── skills/playground-slice/SKILL.md
├── skills/source-intake-steward/SKILL.md
├── skills/stage-manager/SKILL.md
├── skills/talk-to-stage-manager/SKILL.md
├── skills/test-audit/SKILL.md
└── skills/vault-steward/SKILL.md

Included Skills9

beads-workflowskills/beads-workflow/SKILL.md

Run or resume one bounded journey of the planning and research kind or the engineering kind on native Beads through direct bd commands. Use when a dispatch or a fresh-context resume names a Bead, a workflow kind, or a bd write on the isolated store, or when an engineering run reaches a repair prerequisite that blocks a join, a mid-repair Handback, or a lane substitution.

cli-designskills/cli-design/SKILL.md

Build, maintain, or extend a Bun and TypeScript CLI for humans and agents. Use for a new read-only CLI, a state-changing CLI, adding a CLI to an existing Bun project, choosing simple versus complex structure, adding commands or Branch Stations, changing behavior, fixing a CLI bug, or proving Contract Core 2.0 behavior with the checker.

evaluate-sliceskills/evaluate-slice/SKILL.md

Independently evaluate a My Second Brain playground vertical slice through real process, persistence, and fresh-agent recovery evidence. Use to define observable acceptance or judge an implemented slice before promoting its baseline.

playground-sliceskills/playground-slice/SKILL.md

Grow or resume the My Second Brain playground through small, proven vertical slices. Use to continue an existing Task's note work, choose the next experiment, implement an agreed slice, or assess what a completed slice taught us.

source-intake-stewardskills/source-intake-steward/SKILL.md

Classify and file one granted Drive 00 Inbox item through an exact-item proposal, Nathan's decision, verified Drive effects, a linked vault source-artifact note, and recoverable handback. Use for the Source Intake Steward Cast Role or a one-item inbox digest; use the same route to resume a partly filed item.

stage-managerskills/stage-manager/SKILL.md

Take the Stage Manager role as a project's coordinator. Use at coordinator startup when a coordinator pointer or Nathan names you Stage Manager, to resume that role after relaunch or compaction, or before a coordinator casts a Herdr worker pane. A worker thread's brief never grants this role.

talk-to-stage-managerskills/talk-to-stage-manager/SKILL.md

Connect to an existing Herdr project coordinator by short tab name from Codex Desktop or another pane. Prototype for conversational and voice access.

test-auditskills/test-audit/SKILL.md

Audit tests when writing, changing, or reviewing My Second Brain Playground plugin tests. Gate new tests and find low-value, implementation-coupled, or duplicative coverage and test-only production seams.

vault-stewardskills/vault-steward/SKILL.md

Commit declared playground-vault notes onto canonical main through the Vault Steward CLI: begin, preview, apply, inspect, recover.

Plugin manifests2

config/agents/plugins/my-second-brain-playground/.codex-plugin/plugin.json
{
  "name": "my-second-brain-playground",
  "version": "0.16.7",
  "description": "A local playground for building My Second Brain skills one vertical slice at a time.",
  "author": {
    "name": "Nathan Vale"
  },
  "skills": "./skills/",
  "hooks": "./hooks/codex/hooks.json",
  "interface": {
    "displayName": "My Second Brain Playground",
    "shortDescription": "Build and exercise one knowledge workflow at a time",
    "longDescription": "A local scaffold for new My Second Brain skills, exercised against the separate synthetic playground repository one vertical slice at a time.",
    "developerName": "Nathan Vale",
    "category": "Productivity",
    "capabilities": [
      "Read",
      "Write"
    ],
    "defaultPrompt": "Commit a finished change to the My Second Brain playground without disturbing another agent's work."
  }
}
config/agents/plugins/my-second-brain-playground/.claude-plugin/plugin.json
{
  "name": "my-second-brain-playground",
  "version": "0.16.7",
  "description": "A local playground for building My Second Brain skills one vertical slice at a time.",
  "author": {
    "name": "Nathan Vale"
  },
  "hooks": "./hooks/claude/hooks.json"
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[my-second-brain-playground on Agent Plugins Marketplace](https://pluginsmp.com/plugins/my-second-brain-playground)