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578c312660
The Copilot API enforces per-account prompt token limits (128K individual, 168K business) that are lower than the total context window (200K). When the dynamic /models API fetch fails or returns no capabilities.limits, the static fallback of 200K exceeds the real enforced limit, causing intermittent "prompt token count exceeds the limit" errors. Two complementary fixes: 1. Lower static Copilot Claude model ContextLength from 200000 to 128000 (the conservative default matching defaultCopilotContextLength). Dynamic API limits override this when available. 2. Add context_length and max_completion_tokens to Claude-format model responses so Claude Code CLI can learn the actual Copilot limit instead of relying on its built-in 1M context configuration.