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fix(#4717): consult the per-install runtime marker at both identity seams (#4861)

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* test(#4717): add failing-first coverage for the two runtime-identity marker seams

* fix(#4717): consult the per-install runtime marker at both identity seams

resolveReportedRuntime (agent_runtime) and loadConfigResolved
(config.runtime) both ignored the per-install .gsd-runtime marker that
resolveRuntime and the model-resolver gate already read. On a
multi-runtime machine (e.g. a globally exported CODEX_HOME), host sniffing
misreported every Claude Code session as codex, and a shared
defaults.json stamped by the first non-Claude install leaked its runtime
to every other one.

Seam 1: the reported-runtime ladder becomes explicit > install marker >
host detection > claude. Seam 2: loadConfigResolved fills an empty
config.runtime from GSD_RUNTIME then the marker, copy-on-write (the
builtin-defaults branch returns a shared object). Explicit runtimes and
marker-less trees are unchanged.

* fix(#4717): a marker-detected runtime opts into its tier map (decision a)

* fix(#4717): stamped-defaults leg, marker fail-safe, docs, review fold-ins

* chore(#4717): backfill changeset PR number (4861)

---------

Co-authored-by: sim <sim@local>
This commit is contained in:
Tom Boucher
2026-09-18 13:50:01 -04:00
committed by GitHub
parent 58c7bbb16a
commit 9a41a95212
10 changed files with 343 additions and 33 deletions
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docs/how-to/configure-model-profiles.md
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@@ -187,7 +187,7 @@ quota / rate-limit failures; other failures keep the tier ladder. Leaving
## Using GSD on non-Anthropic runtimes
If you installed GSD for Codex, OpenCode, Antigravity CLI, or Kilo, the installer already set `resolve_model_ids: "omit"` in your config. This prevents unresolved Anthropic model IDs from leaking into those runtimes. When `runtime` is set, runtime-native profile resolution still supplies any model and effort that the runtime adapter can transport. No manual setup is needed for the basic case.
If you installed GSD for Codex, OpenCode, Antigravity CLI, or Kilo, the installer already set `resolve_model_ids: "omit"` in the shared config. This prevents unresolved Anthropic model IDs from leaking into those runtimes. Your install's recorded runtime identity (the `.gsd-runtime` marker) tells GSD which runtime tier map to resolve instead, so runtime-native profile resolution still supplies any model and effort that the runtime adapter can transport. No manual setup is needed for the basic case.
### Codex routes tiers at spawn time when supported