Using Claude Code: session management and 1M context

2026-04-15 · Source: Claude Blog · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering · Depth: Intermediate, medium

Summary

Anthropic's Claude Code, featuring a 1 million token context window, requires careful session and context management to optimize performance and avoid "context rot," where model efficacy degrades due to excessive or irrelevant information. The platform offers several mechanisms for managing context, including continuing a session, using `/rewind` to revert to a previous state, `/clear` to start a new session, `/compact` to summarize existing context, and employing subagents for isolated tasks. A new `/usage` slash command helps users monitor their context consumption. Understanding when to apply each method—such as starting a new session for a new task or using subagents for tasks generating extensive intermediate output—is crucial for maintaining efficiency and accuracy in development workflows with Claude Code.

Key takeaway

For AI Engineers and Software Engineers using Claude Code, strategically managing your context window is critical to prevent performance degradation. When starting a new task, initiate a fresh session with `/clear` to ensure optimal model focus. For iterative corrections, use `/rewind` to efficiently prune irrelevant history. Leverage subagents for tasks that generate substantial intermediate output, keeping your main session clean and focused on core objectives.

Key insights

Effective context management in Claude Code is crucial for optimizing performance and mitigating "context rot."

Principles

• New tasks warrant new sessions.
• Context rot degrades model performance.
• Subagents isolate noisy intermediate outputs.

Method

Manage Claude Code sessions by choosing between continuing, `/rewind` for corrections, `/clear` for new tasks, `/compact` for summarization, or subagents for isolated work, based on task and context relevance.

In practice

• Use `/usage` to monitor Claude Code token consumption.
• Employ `/rewind` (double-Esc) to correct failed attempts.
• Delegate noisy tasks to subagents for clean context.

Topics

• Claude Code
• Session Management
• Context Window
• Compaction
• Context Rot

Best for: AI Engineer, Software Engineer, Machine Learning Engineer

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• Claude Code — MEMORY.md: Everything you need to Know & How to get started? — Claude Code's auto-memory autonomously preserves project context across sessions, enhancing developer workflow continuity.
• I kept building LLM apps that worked in demos and broke in production. — Effective LLM application performance hinges critically on context management, not solely on the underlying model.
• I Wasted 6 Months Using Claude Code Wrong. Here Are the 14 Commands That Changed Everything. — Undiscovered commands in AI coding tools can significantly hinder productivity and context management.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Claude Blog.