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second-brain

v4.16.0

Shared project knowledge in Markdown and Git: three short startup reads, a reference manual, four focused procedures, topic records, pending-save recovery and verified publication.

CodexClaude Code10 Skills

By Mike Rihm0 GitHub starsUpdated yesterday

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
10 skill or MCP entries
Source updated
Sep 23, 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
codex plugin marketplace add Mar5929/claude-toolkit
codex plugin marketplace upgrade claude-toolkit
codex plugin add second-brain@claude-toolkit

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

Compatibility: the page URL and API slug “second-brain-2” remain stable.

  • Codex: second-brain-2@agent-plugin-marketplace → second-brain@claude-toolkit

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/Mar5929/claude-toolkit

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

Plugin files

plugins/second-brain/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/knowledge-find/SKILL.md
├── skills/knowledge-review/SKILL.md
├── skills/knowledge-save/SKILL.md
├── skills/knowledge-setup/SKILL.md
├── skills/recall/SKILL.md
├── skills/reflect/SKILL.md
├── skills/remember/SKILL.md
├── skills/retire/SKILL.md
├── skills/second-brain/SKILL.md
└── skills/session-search/SKILL.md

Included Skills10

knowledge-findskills/knowledge-find/SKILL.md

Use before asking the owner to repeat something, before broad investigation, or when sources conflict. Finds what this project already knows, including earlier sessions, and cites each source.

knowledge-reviewskills/knowledge-review/SKILL.md

Use when the owner asks to review or clean up project knowledge, when a record may be duplicated, contradicted, or out of date, or when memory selection feedback needs merging. Finds the problems and sends every change through knowledge-save.

knowledge-saveskills/knowledge-save/SKILL.md

Use when the owner settles a decision, gives a requirement or correction, or says "remember this", and before creating or changing any file under knowledge/. Drafts the proposal card, and after approval starts a helper agent to save it. Also finishes and recovers unfinished saves, and updates, supersedes, retires, deletes, or consolidates records.

knowledge-setupskills/knowledge-setup/SKILL.md

Inspect, enable, migrate, repair or update this project's Knowledge System and verify which parts actually work. Coordinates complete project setup with project-init and project-sync while preserving existing content and choices.

recallskills/recall/SKILL.md

Compatibility entry for knowledge-find; open the current procedure for this request.

reflectskills/reflect/SKILL.md

Compatibility entry for knowledge-review; open the current procedure for this request.

rememberskills/remember/SKILL.md

Compatibility entry for knowledge-save; open the current procedure for this request.

retireskills/retire/SKILL.md

Compatibility entry for knowledge-save; open the current procedure for this request.

second-brainskills/second-brain/SKILL.md

Compatibility entry for knowledge-setup; open the current procedure for this request.

session-searchskills/session-search/SKILL.md

Compatibility entry for knowledge-find; open the current procedure for this request.

Plugin manifests2

plugins/second-brain/.codex-plugin/plugin.json
{
  "name": "second-brain",
  "version": "4.16.0",
  "description": "Shared project knowledge in Markdown and Git: three short startup reads, a reference manual, four focused procedures, topic records, pending-save recovery and verified publication.",
  "author": {
    "name": "Mike Rihm",
    "email": "[email protected]",
    "url": "https://github.com/Mar5929"
  },
  "homepage": "https://github.com/Mar5929/claude-toolkit",
  "repository": "https://github.com/Mar5929/claude-toolkit",
  "keywords": [
    "toolkit",
    "workflow",
    "skills"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Second Brain",
    "shortDescription": "One Markdown project brain for agents and people.",
    "longDescription": "Equips an opted-in project with one managed Knowledge manual, four focused procedures, topic memory, requirements, current work and a pending inbox. Three generated indexes make records and outside sources findable. Native agents evaluate meaning and permission; tools check structure and local/remote save evidence. Setup preserves records and reports actual host support separately.",
    "developerName": "Mike Rihm",
    "category": "Productivity",
    "capabilities": [
      "Interactive",
      "Write",
      "Repository"
    ],
    "websiteURL": "https://github.com/Mar5929/claude-toolkit",
    "defaultPrompt": [
      "Set up project knowledge in this project",
      "Remember this",
      "What has this project already decided about X?",
      "Review what is saved for duplicates and contradictions"
    ],
    "brandColor": "#2563EB"
  }
}
plugins/second-brain/.claude-plugin/plugin.json
{
  "name": "second-brain",
  "description": "Shared project knowledge in Markdown and Git: three short startup reads, a reference manual, four focused procedures, topic records, pending-save recovery and verified publication.",
  "version": "4.16.0",
  "author": {
    "name": "Mike Rihm",
    "email": "[email protected]"
  }
}

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.

[second-brain on Agent Plugins Marketplace](https://pluginsmp.com/plugins/second-brain-2)