`coli serve` runs the engine with SERVE_BATCH=1 (openai_server.py), which
selects run_serve_mux, which sets g_draft=0 — speculation isn't ragged-safe
across the multi-slot batch. But the "[MTP] active: native speculative decoding
(draft=N)" line is printed in main() BEFORE the serve path is chosen, so
`coli serve DRAFT=8` announced draft=8 and then silently disabled it.
@LordMZTE reported the misleading message.
The load line and the [MTP] stderr line now detect the mux case (SERVE +
SERVE_BATCH) and report it truthfully: "MTP DISABLED (multiplexed serve)" with
draft=0, plus a one-line explanation that single-client interactive use
(`coli chat`, which spawns run_serve without SERVE_BATCH) keeps MTP. No more
draft=8 claim on a path that runs draft=0.
This is the honesty half of #358. The feature half — MTP inside the HTTP
server for a single client — is a real enhancement but needs engine work: the
mux decode kernel would have to run the speculative path when exactly one KV
slot is active (S=1 is not actually ragged), and it needs a server round-trip
test. Tracked separately; the message no longer lies in the meantime.
Reported-by: LordMZTE <#358>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JustVugg
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