chronicle-mcp

chronicle-mcp is a local Model Context Protocol (MCP) server providing persistent, queryable memory for Crusader Kings II tabletop-style roleplaying sessions. It equips AI agents with direct tools to log and retrieve characters, timeline events, and lore documents ("tomes"), backed entirely by plain JSON files on disk.

Features & Safe Upsert Behavior

• Explicit ID Upserting: Calling upsert_character or upsert_tome without an id always creates a new record with a fresh ID, even if an existing character or tome shares the same name/title (crucial for tabletop RP campaigns with recurring or dynastic names across generations).

• Lookup Helpers: Use find_character_by_name or find_tome_by_title to search for existing records and retrieve their id before performing updates with upsert_*.

• Standardized Responses: All tool responses follow a consistent { success: boolean, ...data, message?: string } shape.

• Robust Storage: Fast in-memory cached reads paired with ~300ms debounced disk writes and automatic recovery for corrupted JSON files.

Related MCP server: ai-journal

Setup

1. Install dependencies:

   npm install

2. Build the project:

   npm run build

Running the Smoke Test

To run the complete automated smoke test suite (including isolated CRUD, non-overwriting upsert checks, and corrupt file recovery tests) against a temporary scratch directory (./data-test/), run:

npm run test:smoke

Antigravity CLI Registration

Register chronicle-mcp in your Antigravity CLI configuration (global at ~/.gemini/config/mcp_config.json or project-level at .agents/mcp_config.json):

{
  "mcpServers": {
    "chronicle": {
      "command": "node",
      "args": ["c:/Users/manji/Downloads/chronicle-mcp/build/index.js"],
      "env": {
        "CHRONICLE_DATA_DIR": "c:/Users/manji/Downloads/chronicle-mcp/data"
      }
    }
  }
}

(Replace c:/Users/manji/Downloads/chronicle-mcp with the absolute path to your local chronicle-mcp installation directory if installed elsewhere).

Data & Backups

All persistent campaign memory is stored in three plain JSON files inside the data/ directory (characters.json, timeline.json, and tomes.json). Creating a full backup of your RP campaign is as simple as copying or committing the data/ folder. You can also customize the data storage location by setting the CHRONICLE_DATA_DIR environment variable in your mcp_config.json. "# chronicle-mcp"