P68 (auto force tool_choice=required) and P69 (inject "must use a
tool" reminder) silently fired on prompts > 8000 chars — every IDE
agent (Cline, Cursor, OpenCode, Copilot Gateway) blew past that
threshold instantly and got silent finish_reason=stop with no
content + no tool_calls on greetings or clarifying questions.
Bisection on club-3090#2 (HoodOG1 + tenitram):
state A (P64+P68+P69+PN8): broken
state B (P64+P69+PN8, P68 off): still broken — model loops on
"I cannot respond with plain text" then stops mid-reasoning
state D (P64+PN8, P68+P69 off): clean — greeting → plain-text
reply; tool request → clean read_file call
P64 (qwen3coder MTP streaming early-return fix) and PN8 (FP8+MTP
draft online-quant memory savings) stay enabled — real bugfixes,
no user-intent override.
Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
