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second-brain

v0.3.8

Shared foundation for Spillwave ContentPack plugins: OKF schemas, typed edges, deterministic write helpers, and progressive-disclosure packing. Dual-host (Claude Code + Grok Build + Codex).

CodexClaude CodeAgent Plugins6 Skills

By Rick HightowerLicense: MIT1 GitHub starsUpdated last month

Directory evidence

Runtimes
Codex, Claude Code, and Agent Plugins
Parsed components
6 skill or MCP entries
Source updated
Sep 12, 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 second-brain for Codex and Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install second-brain-3@agent-plugin-marketplace

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

Compatibility: the page URL and API slug “second-brain-3” remain stable.

  • Codex: Legacy selector second-brain-3@agent-plugin-marketplace remains documented for migration; install from source for this runtime.

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.

Codex has another source with the same manifest name. This directory does not invent numbered install aliases; use the publisher's catalog or inspect the source manually for that runtime.

Get the source manually
git clone https://github.com/SpillwaveSolutions/second-brain-core

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The repository root is the plugin root.

Plugin files

second-brain/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── plugin.json
├── skills/sbc-capture/SKILL.md
├── skills/sbc-doctor/SKILL.md
├── skills/sbc-init/SKILL.md
├── skills/sbc-pack/SKILL.md
├── skills/sbc-retrieve/SKILL.md
└── skills/sbc-session/SKILL.md

Included Skills6

sbc-captureskills/sbc-capture/SKILL.md

Capture a Second Brain Core noun into the shared second brain via the deterministic write helper.

sbc-doctorskills/sbc-doctor/SKILL.md

Health-check the Second Brain Core catalogs and report empty indexes or missing schemas.

sbc-initskills/sbc-init/SKILL.md

Scaffold the Second Brain Core catalogs in a shared second-brain bundle.

sbc-packskills/sbc-pack/SKILL.md

Build a bounded ContextPack from a Second Brain Core root concept (default 2 hops, 20 nodes, 1/4 window token budget).

sbc-retrieveskills/sbc-retrieve/SKILL.md

Spawn a retrieval sub-agent for second-brain Q&A so search and pack stay off the parent context.

sbc-sessionskills/sbc-session/SKILL.md

Open or close an isolated second-brain write session (worktree + PR). Use before writing when multiple agents share one knowledge remote.

Plugin manifests3

.codex-plugin/plugin.json
{
  "name": "second-brain",
  "hooks": "./hooks/codex-hooks.json"
}
.claude-plugin/plugin.json
{
  "name": "second-brain-core",
  "version": "0.3.8",
  "description": "Shared foundation for Spillwave ContentPack plugins: OKF schemas, typed edges, deterministic write helpers, and progressive-disclosure packing. Dual-host (Claude Code + Grok Build + Codex).",
  "author": {
    "name": "Rick Hightower",
    "url": "https://github.com/RichardHightower"
  },
  "homepage": "https://github.com/SpillwaveSolutions/second-brain-core",
  "repository": "https://github.com/SpillwaveSolutions/second-brain-core",
  "license": "MIT",
  "keywords": [
    "okf",
    "context-pack",
    "second-brain",
    "typed-edges",
    "progressive-disclosure",
    "claude-code",
    "grok-build",
    "codex",
    "okf",
    "content-pack",
    "worklog",
    "wiki-ticket-sdd"
  ]
}
plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "second-brain-core",
  "version": "0.3.8",
  "description": "Shared foundation for Spillwave ContentPack plugins: OKF schemas, typed edges, deterministic write helpers, progressive-disclosure packing, and write isolation.",
  "author": {
    "name": "Rick Hightower",
    "url": "https://github.com/RichardHightower"
  },
  "homepage": "https://github.com/SpillwaveSolutions/second-brain-core",
  "repository": "https://github.com/SpillwaveSolutions/second-brain-core",
  "license": "MIT",
  "keywords": [
    "okf",
    "context-pack",
    "second-brain",
    "isolation",
    "agent-plugins",
    "claude-code",
    "grok-build",
    "codex",
    "deep-agents",
    "cursor",
    "worklog",
    "wiki-ticket-sdd"
  ]
}

For maintainers

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[second-brain on Agent Plugins Marketplace](https://pluginsmp.com/plugins/second-brain-3)