LocalSynapse MCP Server Adds macOS Support and Search Improvements

LocalSynapse is an MCP server that enables Claude to search inside local documents (Word, Excel, PDF) fully offline. The tool has been updated with macOS support and several search improvements based on community feedback.

macOS Version Now Available

The macOS version works as an MCP server with Claude Desktop and Claude Code, using the same hybrid BM25 + semantic search engine as the existing version. Setup requires adding the following configuration:

{
  "mcpServers": {
    "localsynapse": {
      "command": "/path/to/LocalSynapse",
      "args": ["mcp"]
    }
  }
}

Search Improvements

Based on feedback from the r/ClaudeAI community, several search enhancements have been implemented or are planned:

• Multi-word search fix: A bug causing queries like "sifive structure" to return zero results has been fixed and shipped.
• Position-adjusted click boosting: Clicking result #8 after skipping results 1-7 provides a stronger positive signal than raw click counts. This feature is next on the roadmap.
• Re-query as negative signal: When a user searches, clicks a result, then searches again within seconds, that click is tracked as a probable miss.
• Time decay as promotion: Instead of punishing old documents, newer documents receive a small boost when scores are close, which is particularly useful for financial and legal documents that remain relevant for years.

Additional Updates

The latest version also properly excludes cloud-synced files from indexing statistics. LocalSynapse remains a free, fully offline side project developed by a single developer.