MemPalace

A searchable memory palace for AI — mine projects and conversations, then search them semantically. Verbatim storage, local-first, zero external API by default.

Prerequisites

Ensure mempalace is installed:

mempalace --version

If not installed (uv recommended):

uv tool install mempalace   # or: pip install mempalace

Dynamic, version-correct instructions

MemPalace exposes operation-specific instructions through the CLI so this skill stays accurate as MemPalace evolves. To get instructions for any operation:

mempalace instructions <command>

Always prefer the CLI output over what is written here when the two disagree — the CLI is the single source of truth for the installed version.

Common operations

These are the five operations users ask for most often. Each one wraps a single MemPalace CLI subcommand. The mempalace instructions <name> form returns the full, version-correct guidance.

help — discover what MemPalace can do

mempalace instructions help

Use when the user is new, unsure what's possible, or asks "what can you do".

init — first-run setup of the palace

mempalace instructions init

Use when the user has just installed MemPalace, no palace exists yet, or the user explicitly asks to set up / configure / re-initialize their palace.

mine — ingest a project or conversation directory

mempalace instructions mine

Use when the user wants to fold a project's files into their palace, or to ingest exported conversation transcripts into the palace as searchable memory.

search — find verbatim memories by semantic query

mempalace instructions search

Use when the user wants to recall something from the past, find a previous decision, or rediscover code/notes/conversations they already wrote.

status — what's in the palace right now

mempalace instructions status

Use when the user asks "what's in my palace", "how big is my palace", or wants a summary of wings, rooms, and drawer counts.

MCP tools (preferred over CLI)

Inside Antigravity, the MemPalace MCP server registers a rich set of tools. Use these instead of shelling out to the CLI for live operations (search, diary writes, drawer adds, knowledge graph queries, palace status). The MCP tools always reflect the current palace state without spawning a subprocess.

The MCP server is auto-registered when this plugin is installed at ~/.gemini/config/plugins/mempalace/. If the server does not appear in Antigravity's MCP store, run mempalace-mcp --version to verify the binary is on PATH, then restart Antigravity.

Design principles (verbatim from the project)

• Verbatim always — never summarize, paraphrase, or lossy-compress user data.
• Local-first, zero external API by default — extraction, embedding, and LLM-assisted refinement happen on the user's machine.
• Privacy by architecture — the system never calls out to external services for core operations.
• Performance budgets — hooks under 500ms; startup injection under 100ms.
• Background everything — filing, indexing, and timestamps happen via hooks in the background; zero tokens spent on bookkeeping in the chat window.

If a request would violate any of these principles, refuse and explain — even if it would be technically convenient.