Writer Context Tool is an MCP server that enables Claude to access and analyze your Substack and Medium writing. It fetches posts from your blogs via RSS feeds, caches them permanently on disk, and creates embeddings for each post. This enables semantic search to identify the most relevant essays in response to a query and to present Claude with precise, context-rich resources. Each essay is exposed as a separate resource within Claude Desktop, allowing you to reference full texts or snippets directly in prompts. To improve performance, the server preloads all content and embeddings at startup, so responses can be delivered with low latency. Configuration is managed through a config.json file that lists platforms (type, URL, and a human-friendly name), plus parameters such as max_posts, cache_duration_minutes, and similar_posts_count. The MCP integration is designed to work with Claude Desktop by launching the writer-tool server (scripts are provided to run via uv or an alternative shell script). The solution emphasizes permanent caching, local embedding storage, and selective refresh to ensure Claude always has access to your latest work while maintaining fast access to historical content.