dsh-mcp-lens

When DeepSeek Harness connects to multiple MCP servers, tool counts can balloon into the thousands, driving up API input costs, clogging context windows with verbose schema descriptions, and risking efficiency losses. MCP Lens tackles this by funneling the entire MCP catalog through just two stable model-facing interfaces: mcp_search and mcp_call. Instead of loading every tool upfront, it dynamically reveals exact tool schemas only for a small, ranked subset when actually needed. This slashes request JSON size and token consumption while maintaining task completion rates comparable to direct clients.

The core strength lies in intelligent retrieval and lazy loading. MCP Lens indexes a frozen tool catalog, searches it to find the most relevant tools for a query, and then invokes the target server. This approach not only reduces standing context bloat but also supports multiple servers, long-tail tools, and fine-grained permissions—ensuring unused tools don't hog resources and a single server outage won't derail others.

This plugin is ideal for users managing dozens to thousands of MCP tools across several servers, where repeated context and cost pressures mount. If you have only a handful of tools used on every turn, a direct client might suffice; but for complex tool ecosystems, MCP Lens offers a robust way to optimize resource usage and cost efficiency without sacrificing functionality.