Building LLM-Friendly MCP Tools in RubyMine: Pagination, Filtering, and Error Design

**Building LLM-Friendly MCP Tools in RubyMine: Pagination, Filtering, and Error Design**

RubyMine enhances the developer experience with context-aware search features that make navigating a Rails application seamless, a powerful analysis engine that detects problems in the source code, and integrated support for the most popular version control systems. With AI becoming increasingly popular among developers as a tool that helps them understand codebases or develop applications, these RubyMine features provide an extra level of value. Indeed, with access to the functionality of the IDE and information about a given project, AI assistants can produce higher-quality results more efficiently. To improve AI-assisted workflows, since 2025.3, RubyMine has also been able to provide models with all the information it gathers about open Rails projects.  In this blog post, we collected how we implemented the new Rails toolset and what we’ve learned about MCP tool design in the process from a software engineering perspective. What Is Model Context Protocol (MCP)...

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