hollow-attractor 0.2.5

Cross-session personal memory and task protocol for Claude

Hollow Attractor

Cross-session personal memory and task protocol for Claude, implemented as an MCP server.

Claude has no memory between sessions. Hollow Attractor gives it a persistent, structured workspace — tracked in a local git repo, read and written through MCP tools, never sent anywhere.

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How it works

Hollow Attractor runs as a local MCP server connected to Claude Desktop. Each session, Claude loads your current state and picks up where it left off — open tasks, decisions, questions, and a running log.

Everything lives in ~/.hollow-attractor/ as plain text files under git. No cloud, no account, no sync. Your data stays on your machine.

Key concepts

Term	Meaning
Worldline	A named workspace — one project, one scope
Attractor	The global context; entry point for each session
Ship Log	Global index of all worldlines and recent updates
Divergence	A tracked relationship between two worldlines
Anneal	Manual compaction of a worldline with optional intent
Imprint	Plain-text state export for backup or migration

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Install

Requirements: Python 3.10+, git, Claude Desktop

pip install hollow-attractor
hollow init

Then configure the MCP server for your Claude client:

Claude Desktop — edit claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "hollow-attractor": {
      "command": "hollow",
      "args": [],
      "env": {}
    }
  }
}

Claude Code (CLI) — edit ~/.claude.json, using the full path to the hollow binary:

{
  "mcpServers": {
    "hollow-attractor": {
      "type": "stdio",
      "command": "/full/path/to/hollow",
      "args": [],
      "env": {}
    }
  }
}

To find the full path: which hollow (macOS/Linux) or where hollow (Windows).

Restart Claude Desktop / Claude Code after saving.

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Usage

Start a session in Claude Desktop and say:

hollow, start

Claude will load the hollow_start prompt, read your Ship Log, and resume your current worldline.

From there you can create worldlines, add tasks, log decisions, track open questions, and commit state — all through conversation.

See SYSTEM_PROMPT.md for the full protocol and SCHEMAS.md for file formats.

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Migrating from an existing system

Already tracking tasks in Notion, Todoist, a custom Claude setup, or anywhere else? See MIGRATION.md for a prompt you can paste into Claude Desktop to bring your existing backlog across.

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Status

V1 is complete and in active daily use. The core protocol is stable.

Planned next:

• Homebrew formula
• Hosted sync (V2)

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Support

If Hollow Attractor is useful to you, consider sponsoring development:

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License

MIT