mcpfoldWhat is a context window?
Also: context window, context length
A context window is the maximum amount of text, measured in tokens, that a language model can consider at once — including every MCP tool schema loaded into it.
A model can only reason over what fits in its context window. That budget is shared across the system prompt, the conversation, any retrieved content, and the schemas of every tool the connected MCP servers expose.
Because tool schemas are counted whether or not the tools are used, connecting many MCP servers can quietly spend a meaningful fraction of the window before the real work begins.
Curating which servers and tools load — the core of what mcpfold does — keeps more of the context window available for the task at hand. The committed benchmark quantifies the savings.
Related
mcpfold is an independent, open-source project. The Model Context Protocol is an open standard; mcpfold is not affiliated with or endorsed by the MCP project.