Same bug family as #47828, at the config-persistence layer instead of
the in-memory agent layer:
- cli.py (#25106): the --global /model handlers (both the typed-name
path in _handle_model_switch and the picker path in
_apply_model_switch_result) wrote model.default/model.provider to
config.yaml but never touched base_url/api_mode at all. A provider
switch left the OLD endpoint on disk; the next launch reconnected to
the previous provider's host under the new model name.
- gateway/slash_commands.py (#25107): both persist-global blocks (the
picker-tap callback and the typed /model --global path) guarded the
write with two INDEPENDENT ifs — `if result.base_url: ...` and
`if target_provider != "custom": clear_model_endpoint_credentials(...)`.
For named providers the second if always cleared stale values, masking
the bug. For a custom provider with an empty resolved base_url, neither
branch fired, so the previous custom endpoint's base_url/api_key/
api_mode survived untouched in config.yaml.
Fix: explicit set-if-truthy/clear-if-falsy for base_url and api_mode at
all four call sites, matching the already-correct pattern in
tui_gateway/server.py:_persist_model_switch (fixed for #48305).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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