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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v1.0.94 27 Aug 2025

Performance Context Warnings

What: New warning system that monitors context consumption from custom agents and MCP tools How to use:

# Warnings appear automatically when thresholds are exceeded
# Agent descriptions > 15,000 tokens will trigger a warning
# MCP tools > 25,000 tokens will trigger a warning

Details:

Monitors cumulative token count of custom agent whenToUse descriptions
Tracks total context consumed by MCP tool definitions
Shows top contributors by token consumption for optimization
Integrated with existing CLAUDE.md size warnings into unified system
Evidence: kY1() at line 399348, XV5() at line 399376, FV5() at line 399400, WSB() at line 399442

See this entry in the whole of v1.0.94 →