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fix(#4270): forward Codex spawn model routing (#4281)

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Co-authored-by: Tom Boucher <trekkie@nomorestars.com>
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Michel Moreira
2026-09-05 15:20:26 -03:00
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parent 7ff196c505
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8 changed files with 114 additions and 45 deletions
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docs/adr/2313-codex-passive-model-posture.md
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@@ -334,3 +334,18 @@ is silently no-pin, matching how `""` already behaved.
This ADR's D2 ("embed a `model` only for an explicit real-Codex pin") always implied this. The
implementation simply did not enforce it, and no test covered the case.
## Amendment (2026-09-04): capability-gated invocation-time routing (#4270)
Codex now exposes `model` and `reasoning_effort` on some `spawn_agent` schemas. This is the
invocation-time capability signal that did not exist when this ADR adopted a session-only posture.
GSD therefore passes a workflow's resolved values on an individual spawn when — and only when —
the visible schema advertises each field. The fields are detected independently from each other
and from `agent_type`; absent fields, empty values, and `"inherit"` continue to degrade to session
or static agent configuration.
This amendment does not reverse D1–D4 for the static/install-time channel. Profile-resolved values
remain absent from generated TOML, explicit `model_overrides` pins remain the only static model
transport, and effort remains coupled to a static pin there. It supersedes only the broader claim
that Codex has no tier routing: capable schemas now route at invocation time, while older schemas
retain the passive fallback.