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Introducing Tome

· 3 min read
Midnight Foundation
Midnight Foundation
Makers of Tome

Today we're releasing the public beta of Tome — a cross-harness plugin manager for AI coding agents. Manage your skills, commands, agents, and hooks in one place, then search and load them on demand across Claude Code, Cursor, Codex, Gemini CLI, and OpenCode.

The problem​

The AI coding agent ecosystem is fragmenting. Each harness has its own way to configure skills, agents, rules, and hooks. Build something great for one and you've built it for one — porting it to the next means relearning a different config format. And the more capabilities you add, the more you stuff into the agent's context window up front, burning tokens on things the current task will never touch.

What Tome does​

Tome sits between you and every harness it supports.

  • Cross-harness management. Enable a plugin once. Tome translates it into each harness's native configuration — rules files, MCP wiring, native agents and hooks where the harness supports them. Build once, use everywhere.
  • Search and load on demand. Tome indexes every enabled skill and command for semantic search. Instead of loading your whole library into context, your agent searches at runtime over the MCP server and loads only what it needs. That protects the context window and cuts token spend.
  • Workspaces. Different projects need different tools. Workspaces give you per-project composition — different catalogs and plugins enabled per workspace, bound to your project directories.
  • Local and private. Tome runs on your machine. The semantic index, the reranker, and the embedding models are all local. No telemetry.

Install​

Tome ships as a single self-contained binary:

# macOS · Homebrew
brew install aaronbassett/homebrew-tap/tome

# or with cargo
cargo install tome-mcp

See the Install guide for prerequisites and platform support.

Start with Midnight Expert​

The flagship catalog is Midnight Expert from the Midnight Foundation: AI plugins for building, testing, and verifying Compact smart contracts. Add it and enable it in two commands:

tome catalog add devrelaicom/midnight-expert-tome
tome plugin enable midnight-expert

Then point a harness at it and search:

tome harness use claude-code
tome query "verify a Compact contract"

Publish your own​

A catalog is just a git repo of plugins. If you've built skills, commands, agents, or hooks, publishing them as a catalog means anyone can use your work across every harness Tome supports. The authoring guide walks you through it.

Tome is open source under MIT OR Apache-2.0. Try the beta, and tell us what you build.