Context Mode – 315 KB of MCP output becomes 5.4 KB in Claude Code
Every MCP tool call dumps raw data into Claude Code's 200K context window. A Playwright snapshot costs 56 KB, 20 GitHub issues cost 59 KB. After 30 minutes, 40% of your context is gone. I built an MCP server that sits between Claude Code and these outputs. It processes them in sandboxes and only returns summaries. 315 KB becomes 5.4 KB. It supports 10 language runtimes, SQLite FTS5 with BM25 ranking for search, and batch execution. Session time before slowdown goes from ~30 min to ~3 hours. MIT licensed, single command install: /plugin marketplace add mksglu/claude-context-mode…
Context Mode – 315 KB of MCP output becomes 5.4 KB in Claude Code launched on February 25, 2026 with 84 votes, #445 of 16,628 launches that month and more than 95% of that year's launches.
In plain words
Context Mode is an MCP server that reduces data bloat from tool outputs in Claude Code by processing them in sandboxes and returning only summaries. It compresses typical outputs from hundreds of kilobytes to just a few, extending productive session time from roughly 30 minutes to 3 hours. The tool supports 10 language runtimes, includes SQLite FTS5 search with BM25 ranking, and enables batch execution. It is designed for developers working with Claude Code who encounter context window limitations. Context Mode is MIT licensed and installable via a single command.
written from the facts on this page · September 2026
From the sources
Context window optimization for AI coding agents. Sandboxes tool output (98% reduction), persists session memory, and enforces routing across 17 platforms via MCP + hooks. - mksglu/context-mode
In the maker’s words, at launch
Every MCP tool call dumps raw data into Claude Code's 200K context window. A Playwright snapshot costs 56 KB, 20 GitHub issues cost 59 KB. After 30 minutes, 40% of your context is gone. I built an MCP server that sits between Claude Code and these outputs. It processes them in sandboxes and only returns summaries.…
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