I Kept Hitting Claude’s Session Limit. Here’s Why

2026-07-19 · Source: Artificial Intelligence on Medium · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering · Depth: Intermediate, quick

Summary

A user unexpectedly hit Claude Code's session limit during a refactoring task, despite avoiding large files or complex prompts. Upon inspection using "/context", it was discovered that significant portions of the context window were consumed by "invisible waste." This included outdated MCP server definitions, an excessively large CLAUDE.md file, and 300 lines of "npm install" terminal output that had permanently accumulated. This experience underscores that token limits are frequently reached not through intensive interaction, but due to background data stacking up in every session. The article will detail where Claude spends tokens and evaluate open-source tools developed to mitigate this token burn.

Key takeaway

For AI Engineers managing LLM context windows, understanding token consumption is critical to avoid unexpected session limits. You should regularly inspect your active context using tools like "/context" to identify and prune invisible waste, such as old definitions or verbose terminal outputs. Proactively integrating open-source token management solutions can significantly extend your effective session time and improve workflow efficiency.

Key insights

Invisible background waste, not heavy usage, is the primary cause of hitting Claude's LLM session limits.

Principles

• Token limits are often hit by background waste.
• Context window usage can be silently inflated.

In practice

• Use "/context" to inspect token usage.
• Explore open-source tools for token management.

Topics

• Claude Code
• Token Limits
• Context Window Management
• LLM Efficiency
• Open-Source Tools

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

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Editorial summary, takeaway, and curation by AIssential. Original article published by Artificial Intelligence on Medium.