Context Mode

The other half of the context problem.

Used across teams at

The Problem

Every MCP tool call dumps raw data into your context window. A Playwright snapshot costs 56 KB. Twenty GitHub issues cost 59 KB. One access log — 45 KB. After 30 minutes, 40% of your context is gone. And when the agent compacts the conversation to free space, it forgets which files it was editing, what tasks are in progress, and what you last asked for.

Context Mode is an MCP server that solves all three sides of this problem:

1. Context Saving — Sandbox tools keep raw data out of the context window. 315 KB becomes 5.4 KB. 98% reduction.
2. Session Continuity — Every file edit, git operation, task, error, and user decision is tracked in SQLite. When the conversation compacts, context-mode doesn't dump this data back into context — it indexes events into FTS5 and retrieves only what's relevant via BM25 search. The model picks up exactly where you left off. If you don't --continue, previous session data is deleted immediately — a fresh session means a clean slate.
3. Think in Code — The LLM should program the analysis, not compute it. Instead of reading 50 files into context to count functions, the agent writes a script that does the counting and console.log()s only the result. One script replaces ten tool calls and saves 100x context. This is a mandatory paradigm across all 12 platforms: stop treating the LLM as a data processor, treat it as a code generator.

<img src="https://img.youtube.com/vi/QUHrntlfPo4/maxresdefault.jpg" alt="Watch context-mode demo on YouTube" width="100%">

Install

Platforms are grouped by install complexity. Hook-capable platforms get automatic routing enforcement. Non-hook platforms need a one-time routing file copy.

Prerequisites: Claude Code v1.0.33+ (claude --version). If /plugin is not recognized, update first: brew upgrade claude-code or npm update -g @anthropic-ai/claude-code.

Install:

/plugin marketplace add mksglu/context-mode
/plugin install context-mode@context-mode

Restart Claude Code (or run /reload-plugins).

Verify:

/context-mode:ctx-doctor

All checks should show [x]. The doctor validates runtimes, hooks, FTS5, and plugin registration.

Routing: Automatic. The SessionStart hook injects routing instructions at runtime — no file is written to your project. The plugin registers all hooks (PreToolUse, PostToolUse, PreCompact, SessionStart) and 6 sandbox tools (ctx_batch_execute, ctx_execute, ctx_execute_file, ctx_index, ctx_search, ctx_fetch_and_index) plus meta-tools (ctx_stats, ctx_doctor, ctx_upgrade, ctx_purge, ctx_insight).

Slash Command	What it does
/context-mode:ctx-stats	Context savings — per-tool breakdown, tokens consumed, savings ratio.
/context-mode:ctx-doctor	Diagnostics — runtimes, hooks, FTS5, plugin registration, versions.
/context-mode:ctx-upgrade	Pull latest, rebuild, migrate cache, fix hooks.
/context-mode:ctx-purge	Permanently delete all indexed content from the knowledge base.
/context-mode:ctx-insight	Personal analytics dashboard — 15+ metrics on tool usage, session activity, error rate, parallel work patterns, and mastery curve. Opens a local web UI.

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