Named endpoints from the providers: mapping (and legacy custom_providers:
list) never appear in the ACP model selector: _build_model_state lists
only the canonical current provider's catalog, and canonical provider
enumeration does not include user-defined named endpoints. The TUI
/model picker already renders these entries (#47039, implemented for the
TUI surface only), so editor clients silently hide endpoints the user
configured — e.g. an OpenAI-compatible Bedrock Mantle Responses provider.
Add _named_custom_provider_catalogs(), sourcing entries from
get_compatible_custom_providers() (covers both config shapes), and append
its models to the selector payload. Choice ids use the custom:<name>
slug shape so custom:<name>:<model> selections round-trip through
parse_model_input / resolve_runtime_provider unchanged on set_session_model.
Declared models (default_model + models) survive failed live /models
discovery — some OpenAI-compatible endpoints expose no /models route yet
serve their declared models fine. Honors providers.<name>.enabled: false
and discover_models: false.
Verified: scripts/run_tests.sh tests/acp/ — 318 passed, 0 failed;
scripts/check-windows-footguns.py clean.
Israel Lot
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