Universal Source Management System

A lightweight FastMCP server for managing literature, notes, entity links, and reading-list resources in a local SQLite database.

Current Scope

This repository provides:

• Local SQLite-backed source management
• Notes attached to sources
• Entity links between sources and named concepts
• Read-only database inspection tools
• MCP resources for source lookup and reading lists
• Normalized identifier storage with a transitional JSON cache

It does not integrate with MCP Memory Server or an external memory graph.

Quick Start

1. Create a database from the current schema:

sqlite3 sources.db < create_sources_db.sql

2. Install the FastMCP server with your database path:

fastmcp install sqlite-paper-fastmcp-server.py --name "Source Manager" -e SQLITE_DB_PATH=/path/to/sources.db

3. Optional: use the checked-in demo fixture at examples/sources.db.

Docker

This server can be packaged as a containerized stdio MCP server.

Build the image:

docker build -t sqlite-lit-mcp .

Run it with a persistent SQLite volume:

mkdir -p data
docker run --rm -i \
  -e SQLITE_DB_PATH=/data/sources.db \
  -v "$(pwd)/data:/data" \
  sqlite-lit-mcp

Notes:

• The image defaults SQLITE_DB_PATH to /data/sources.db.
• If the database file does not exist, the container initializes it from create_sources_db.sql.
• If you are mounting an older database, apply the required migrations under migrations/ before starting the server.
• This repo runs as a stdio MCP server, so there is no HTTP port to expose by default.

With Docker Compose:

docker compose run --rm sqlite-lit-mcp

Current Tool Surface

Implemented tools:

• read_query
• list_tables
• describe_table
• get_table_stats
• get_database_info
• vacuum_database
• add_sources
• add_notes
• update_status
• add_identifiers
• link_to_entities
• get_source_entities
• update_entity_links
• remove_entity_links
• get_entity_sources

Implemented resources:

• source://<id>
• source://by-identifier/<type>/<value>
• reading-list://unread
• reading-list://reading
• entity://<entity_name>

Schema Notes

The current schema centers on four tables:

• sources
• source_identifiers
• source_notes
• source_entity_links

sources.identifiers is still kept as a transitional JSON cache, but identifier lookups now use source_identifiers.

Supported identifier types:

• semantic_scholar
• doi
• arxiv
• openalex
• pmid
• isbn
• url

Supported entity relation types:

• discusses
• introduces
• extends
• evaluates
• applies
• critiques
• supports
• contradicts
• refutes

Lightweight provenance fields live on sources:

• provider
• discovered_via
• discovered_at

The schema now uses PRAGMA user_version = 3.

Migration

If you have a version 0 or version 1 database, apply:

sqlite3 /path/to/sources.db < migrations/2026-03-09__normalize-identifiers.sql
sqlite3 /path/to/sources.db < migrations/2026-03-09__expand-entity-relation-types.sql

If you already migrated to version 2, apply:

sqlite3 /path/to/sources.db < migrations/2026-03-09__expand-entity-relation-types.sql

These migrations:

• adds source_identifiers
• backfills identifier rows from the legacy JSON column
• adds provenance fields
• expands source_entity_links.relation_type to include supports, contradicts, and refutes
• updates PRAGMA user_version to 3

The server checks PRAGMA user_version on connection and will reject older databases until they are migrated.

Package Layout

The implementation is organized under sqlite_lit_server/:

• app.py creates the FastMCP instance and registers tools/resources
• db.py owns connection setup and schema-version checks
• repository.py keeps SQL-heavy lookup logic close to the data layer
• tools_admin.py, tools_sources.py, and tools_entities.py hold the MCP tools
• resources.py defines the MCP resources

sqlite-paper-fastmcp-server.py remains as a thin compatibility shim.

Batch Import Sources

add_sources is the batch import entrypoint for new sources. It accepts one argument named sources, where each item is:

[title, source_type, identifier_type, identifier_value, initial_note]

initial_note must be either null or an object with both title and content.

Supported source_type values:

• paper
• webpage
• book
• video
• blog

Supported identifier_type values:

• semantic_scholar
• doi
• arxiv
• openalex
• pmid
• isbn
• url

Duplicate handling:

• Exact identifier matches return Source already exists together with the existing source payload.
• Title-based fuzzy matches return Potential duplicates found. Please verify or use add_identifiers if these are the same source.
• Successful batch writes return one result per input item in the same order as the request.

Example MCP/JSON payload:

{
  "sources": [
    [
      "Attention Is All You Need",
      "paper",
      "arxiv",
      "1706.03762",
      {
        "title": "Initial thoughts",
        "content": "Transformers start here."
      }
    ],
    [
      "OpenAlex Import",
      "paper",
      "openalex",
      "W1234567890",
      null
    ]
  ]
}

Example Python call:

add_sources([
    (
        "Attention Is All You Need",
        "paper",
        "arxiv",
        "1706.03762",
        {
            "title": "Initial thoughts",
            "content": "Transformers start here.",
        },
    ),
    (
        "OpenAlex Import",
        "paper",
        "openalex",
        "W1234567890",
        None,
    ),
])

The same tool payloads work whether you start the server locally or through Docker with docker compose run --rm sqlite-lit-mcp.

Batch Write Conventions

Plural write tools accept lists and return a per-input result list in the same order. Related batch tools include:

• add_notes
• add_identifiers
• update_status
• link_to_entities

Example Usage

Add another identifier:

add_identifiers([
    (
        "Attention Is All You Need",
        "paper",
        "arxiv",
        "1706.03762",
        "semantic_scholar",
        "204e3073870fae3d05bcbc2f6a8e263d9b72e776",
    ),
])

Read a source resource:

source://by-identifier/arxiv/1706.03762