Tool Filter
Proxy server that filters tools from upstream MCP servers using configurable regex patterns to control which tools are exposed to
Tool Filter MCP provides a proxy server that filters tools from upstream MCP servers using regex-based deny patterns, enabling fine-grained control over which tools are exposed. Built by Respawn App using TypeScript and the official Anthropic MCP SDK, it connects to upstream MCP servers via SSE transport, applies configurable regex patterns to filter out unwanted tools, and exposes only the allowed tools through a standard MCP interface. The implementation includes robust regex validation with ReDoS protection, error handling, timeout management, and maintains tool caching for performance, making it valuable for organizations that need to restrict access to specific subsets of available tools while maintaining full MCP compatibility and transparent proxying of allowed tool calls.
Source
Repository: https://github.com/respawn-llc/tool-filter-mcp
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