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Sep 12, 2026
…der is saved without one Leaving the context-length prompt blank in the custom-endpoint wizard said "will auto-detect" and then went silent, so users could not tell whether their endpoint runs on a detected window or the runtime's default fallback (which shapes compression and prompt-cache behaviour). After the save prompt, run the same resolver the runtime uses (with the endpoint's URL and key) and print either "auto-detected N tokens" or "not detected — using the default N tokens". Feedback only: the probe result is not persisted, and a failing probe never blocks the save. Fixes #2513. Approach from PR #2522 (@ygd58) and PR #85499 (@Luna161), both written against the pre-decomposition wizard module. Co-authored-by: Luna161 <268031236+Luna161@users.noreply.github.com>
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Fixes #2513
Problem
When saving a custom provider via /model without specifying a context length, users had no feedback on what context window was being used.
Fix
After the user leaves context length blank, attempt auto-detection via
get_model_context_length(model_name):💡 Context length auto-detected: X tokensand save to config📏 Context length: using default 128,000 tokensTests
Added
tests/test_custom_provider_context_detection.pywith 4 tests:_save_custom_providerwith context_length_save_custom_providerwithout context_length