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xiaoen
9c82b0baa2
Separate context_window from max_tokens — they serve different purposes (input capacity vs output generation limit). The previous conflation caused premature summarization or missed compression triggers. Changes: - Add context_window field to AgentDefaults config (default: 4x max_tokens) - Extract boundary-safe truncation helpers (isSafeBoundary, findSafeBoundary) into context_budget.go — pure functions with no AgentLoop dependency - forceCompression: align split to safe boundary so tool-call sequences (assistant+ToolCalls → tool results) are never torn apart - summarizeSession: use findSafeBoundary instead of hardcoded keep-last-4 - estimateTokens: count ToolCalls arguments and ToolCallID metadata, not just Content — fixes systematic undercounting in tool-heavy sessions - Add proactive context budget check before LLM call in runAgentLoop, preventing 400 context-length errors instead of reacting to them - Add estimateToolDefsTokens for tool definition token cost Closes #556, closes #665 Ref #1439