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lean-ctx is an open-source Rust-based context runtime that reduces token costs for AI coding agents like Claude Code, Cursor, Copilot, and others by 60–95% through file read compression and shell output optimization. It operates as a Shell Hook and MCP Server with 56 tools and multiple read modes.
Microsoft Foundry's Toolbox feature enables durable long-running agents with a single MCP endpoint, reportedly reducing input tokens by 90% and simplifying agent code at cloud scale.
By swapping to Insforge Skills + CLI as the backend context layer, a user cut Claude Code token usage by 64 %, eliminated all errors and reduced cost from $9.21 to $2.81.
A practical guide explaining how Claude Opus 4.7 differs from 4.6, covering the new xhigh effort level, adaptive thinking replacing fixed token budgets, and a 1M context window, with recommendations on how to adjust prompting and delegation strategies to avoid inflated token costs.