Agent stalls mid-turn: preamble line with no tool call follows (requires user nudge) #1117

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) Summary
Agent randomly stalls mid-turn: it prints a conversational :: preamble line (e.g. "Pushing both now — hedge-wizardry first, pi-gauge second.") and then stops. No tool call follows. Session shows * Worked for 1m 20s and waits for user input. Any nudge ("push", "continue", "stalled again ") resumes it from the same state.

Related: #1111 (sub-agents interrupted with no output — same family, but this is the main agent stalling, not a sub-agent).

Repro / frequency

• Random, but much more frequent in long sessions and when a turn needs a chain (preamble → shell → read → shell).
• Single-tool turns (e.g. one web_search) usually land in one go.
• Happened in a forked session where I did nothing except watch — so not caused by user edits mid-turn.

Environment

• cmd --version: 1.88.4
• OS: Arch Linux (hyprland / alacritty terminal)
• Trace ID (copied via /trace at stall time): 15950f53fef5b9f1628951135c7d0180

Expected

Preamble should always be followed by the tool call, or the turn should error visibly instead of going idle with * Worked for ... and no result.

Workaround

Sending any follow-up nudges it and it resumes fine. /compact or a fresh forked session lowers the rate. Nothing is lost (committed turns persist).