It records the asked-for one. CacheMW sits outside the transport in the
onion, so at lookup time the nearest-mapping has not happened yet and the
applied tier does not exist. Telemetry's success rows do record the mapped
tier, which is where the confusion came from — the warning conflated the
two and would have sent anyone debugging a cache miss the wrong way.
Also repairs the design doc: the 2026-09-05 rollback note had been spliced
into the equivalence table, orphaning its last row, and §3.1 still said
seven tiers after `auto` made it eight.
The minimax wire lost its tier value on the assumption that these models
reason by default, so injecting nothing still reads as "on". T10 measured
the real gateway and the assumption does not hold: MiniMax-M3 with no
reasoning parameter did not reason in 5 of 5 rounds, while all six
strength values worked. Existing downstreams on ENABLE_THINKING=true
went from reasoning to silently not reasoning, and the capability table
cannot catch it because phase 5 lets auto through unconditionally.
Restore on_base to the old {"reasoning_effort": "medium"} verbatim. This
is a stopgap - it hands the tier choice back to the library, which this
work set out to remove. The real fix is to constrain auto by the
capability table, a public behaviour change tracked as issue #21.
The assertions that said "minimax injects no tier on the on-tier" go
back with it; each carries a note on why it moved twice.
A provider that registered a disable form but no enable form was told
its shape was unknown and pointed at register_provider -- work it had
already done -- for a request that only ever needed the disable form.
The old bool code took the slot by direction; the tiered rewrite lost
that. Take the relevant field again, and keep "shape unknown" for the
case where both halves are missing, so the "cannot disable" wording
still owns the half-missing case.
Codex argued `effort_fallback` had no verifiable consumer and could wait.
The human overruled that: swapping models is routine, and between "it
stops booting" and "it silently costs more" the caller deserves a middle
option it selects on purpose. So the mapping ships with this round.
issue #20 asks for one zhipu profile. Adding it does not fix what the
issue describes: GLM-5.3 mandates thinking (three sources agree, the
vendor included), so `none` is an undefined value we were sending, and
`medium` — the tier our minimax profile hardcodes — does not exist on
GLM, kimi or deepseek at all.
So the gap is the type, not the table. Capability becomes a tier list
where `none`'s presence answers "can it be turned off", and refusal
carries the cheapest tier that model does support — a refusal with no
way forward is what sent the caller to extra_body in the first place.
Reviewed by Codex, which caught two claims that were wrong: source-level
extra_body and enable_thinking already reach the cache key through the
model fingerprint, and the three reference projects are not in the
workspace, so "no callers" was a grep against absent directories.
iomgaa