Lazy MCP gateway for DeepSeek Harness: one stable proxy tool instead of N tool schemas, servers connect on first use and idle out, metadata cached to disk.
A lazy MCP gateway for DeepSeek Harness. It puts one tool in front of the model instead of N MCP tool schemas: servers start on first use, idle out again, and their tool metadata is cached on disk so search and describe never spawn anything.
@deepseek-ai/dsh-mcp-client connects every configured server at startup and registers every one of its tools as a native tool. As its own README puts it, tool descriptions and input schemas "enter every request while the tools are registered". A handful of servers therefore costs thousands of tokens on every request and one resident child process each — whether or not the model ever calls them.
This plugin keeps the model-facing surface at exactly one tool whose schema never changes, discovers tools on demand from a disk cache, and only spawns a server when a call needs it.
Measured against chrome-devtools-mcp@1.6.0 (29 tools), both sides rendered the same way — JSON bytes of the tool definitions, then four bytes per token:
per request --- --- native registration 21252 bytes ≈ 5313 tokens this gateway 1525 bytes ≈ 381 tokens saved 92.8%
The gateway figure is constant: configuring ten more servers does not move it, because their schemas are read on demand rather than sent every request.
The honest counterweight. The gateway costs a fixed 1525 bytes, so it wins only when a server's rendered tool definitions exceed that. The bundled fixture offers 7 small tools and the saving drops to 1.7%. A server with a couple of tiny tools would make the gateway a net loss. Measure your own before assuming:
From the project README.
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