Expose context window usage to hooks via environment variable

증상

Hooks (PreToolUse, PostToolUse, Stop) have no way to know how much of the context window is consumed. The only context-related env vars available are CLAUDE_TOOL_NAME, CLAUDECODE, and CLAUDE_CODE_SSE_PORT — none expose token usage or context percentage.

원인

Environment variable, configuration file, or initialization parameter missing, malformed, or incorrectly scoped.

해결법

Counting tool calls as a proxy for context consumption. This is:

Fragile — breaks when context window size changes
Imprecise — a Read of a 10-line file vs a 2000-line file consume very different amounts of context
Non-portable — threshold must be manually recalibrated per model/plan

예상 토큰 절약

이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰

출처

https://github.com/anthropics/claude-code/issues/34340

Source: https://github.com/anthropics/claude-code/issues/34340

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