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[codex] prefer inherited spawn agent model (#18701)

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This updates the spawn-agent tool contract so subagents are presented as
inheriting the parent model by default. The visible model list is now
framed as optional overrides, the model parameter tells callers to leave
it unset and the delegation guidance no longer nudges models toward
picking a smaller/mini override.

Fixes reports that 5.4 would occasionally pick 5.2 or lower as
sub-agents.
This commit is contained in:
Thibault Sottiaux
2026-04-20 22:34:08 +00:00
committed by GitHub
parent cebe57b723
commit 54bd07d28c
4 changed files with 57 additions and 12 deletions
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codex-rs/core/src/tools/spec_tests.rs
+4 -2
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@@ -742,10 +742,11 @@ async fn spawn_agent_description_omits_usage_hint_when_disabled() {
assert_regex_match(
r#"(?sx)
^\s*
No\ picker-visible\ models\ are\ currently\ loaded\.
No\ picker-visible\ model\ overrides\ are\ currently\ loaded\.
\s+Spawns\ an\ agent\ to\ work\ on\ the\ specified\ task\.\ If\ your\ current\ task\ is\ `/root/task1`\ and\ you\ spawn_agent\ with\ task_name\ "task_3"\ the\ agent\ will\ have\ canonical\ task\ name\ `/root/task1/task_3`\.
\s+You\ are\ then\ able\ to\ refer\ to\ this\ agent\ as\ `task_3`\ or\ `/root/task1/task_3`\ interchangeably\.\ However\ an\ agent\ `/root/task2/task_3`\ would\ only\ be\ able\ to\ communicate\ with\ this\ agent\ via\ its\ canonical\ name\ `/root/task1/task_3`\.
\s+The\ spawned\ agent\ will\ have\ the\ same\ tools\ as\ you\ and\ the\ ability\ to\ spawn\ its\ own\ subagents\.
\s+Spawned\ agents\ inherit\ your\ current\ model\ by\ default\.\ Omit\ `model`\ to\ use\ that\ preferred\ default;\ set\ `model`\ only\ when\ an\ explicit\ override\ is\ needed\.
\s+It\ will\ be\ able\ to\ send\ you\ and\ other\ running\ agents\ messages,\ and\ its\ final\ answer\ will\ be\ provided\ to\ you\ when\ it\ finishes\.
\s+The\ new\ agent's\ canonical\ task\ name\ will\ be\ provided\ to\ it\ along\ with\ the\ message\.
\s*$
@@ -766,10 +767,11 @@ async fn spawn_agent_description_uses_configured_usage_hint_text() {
assert_regex_match(
r#"(?sx)
^\s*
No\ picker-visible\ models\ are\ currently\ loaded\.
No\ picker-visible\ model\ overrides\ are\ currently\ loaded\.
\s+Spawns\ an\ agent\ to\ work\ on\ the\ specified\ task\.\ If\ your\ current\ task\ is\ `/root/task1`\ and\ you\ spawn_agent\ with\ task_name\ "task_3"\ the\ agent\ will\ have\ canonical\ task\ name\ `/root/task1/task_3`\.
\s+You\ are\ then\ able\ to\ refer\ to\ this\ agent\ as\ `task_3`\ or\ `/root/task1/task_3`\ interchangeably\.\ However\ an\ agent\ `/root/task2/task_3`\ would\ only\ be\ able\ to\ communicate\ with\ this\ agent\ via\ its\ canonical\ name\ `/root/task1/task_3`\.
\s+The\ spawned\ agent\ will\ have\ the\ same\ tools\ as\ you\ and\ the\ ability\ to\ spawn\ its\ own\ subagents\.
\s+Spawned\ agents\ inherit\ your\ current\ model\ by\ default\.\ Omit\ `model`\ to\ use\ that\ preferred\ default;\ set\ `model`\ only\ when\ an\ explicit\ override\ is\ needed\.
\s+It\ will\ be\ able\ to\ send\ you\ and\ other\ running\ agents\ messages,\ and\ its\ final\ answer\ will\ be\ provided\ to\ you\ when\ it\ finishes\.
\s+The\ new\ agent's\ canonical\ task\ name\ will\ be\ provided\ to\ it\ along\ with\ the\ message\.
\s+Custom\ delegation\ guidance\ only\.