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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/USER-GUIDE.md
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@@ -844,7 +844,7 @@ For the full audit, harness reference, and the composition note with `model_prof
> **Codex CLI minimum supported version: `0.130.0`** (issue [#3562](https://github.com/open-gsd/gsd-core/issues/3562)).
If you installed GSD for a non-Claude runtime, the installer already configured model resolution. No manual setup is needed — `resolve_model_ids: "omit"` is set automatically, which tells GSD to skip Anthropic model ID resolution and let the runtime choose its own default model.
If you installed GSD for a non-Claude runtime, the installer already configured model resolution. No manual setup is needed — `resolve_model_ids: "omit"` is set automatically as a Claude protection, and your install's recorded runtime identity tells GSD to skip Anthropic model ID resolution and resolve from the runtime's own model tiers instead.
To assign different models on a non-Claude runtime: