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JslYoon
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asmasarw,
jkilzi,
karthikjeeyar,
mareklibra,
rohitkrai03 and
yangcao77
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September 17, 2026 03:34
Changed Packages
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The /v1/models handler probed each LLM's vision support inline, awaiting up to VISION_PROBE_TIMEOUT_MS per model, so a cold cache could delay the response by ~10s. Serve vision support from the capabilities cache instead: warm the cache at router startup and probe cache misses in the background (deduped per model), returning the model list immediately. The cache self-heals on a miss — a model new to the LCS list, or one whose previous probe failed and was not cached. Signed-off-by: Lucas <[email protected]> Assisted-by: Claude Opus 4.8 Co-Authored-By: Claude Opus 4.8 <[email protected]>
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #4839 +/- ##
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- Coverage 63.60% 60.14% -3.46%
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Files 2685 2673 -12
Lines 107077 106101 -976
Branches 30010 29801 -209
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- Hits 68101 63819 -4282
- Misses 37165 41772 +4607
+ Partials 1811 510 -1301
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Summary
GET /v1/modelsprobed each LLM's vision capability inline, awaiting up toVISION_PROBE_TIMEOUT_MS(10s) per model. On a cold cache this delayed the response by up to ~10s.This change serves vision support from the capabilities cache and moves probing off the request path:
supportsVision: false) immediately and triggers a single background probe (deduped per model via an in-flight set).The per-user
POST /v1/validate-model-visionpath is unchanged (it still awaits, since it needs the answer).Behavior change
On a cold cache, an LLM may report
supportsVision: falsefor the brief window between the first request and the background probe completing; the next request reports the real value.Testing
supportsVision enrichmentsuite for the non-blocking + warm-on-boot contract; added coverage for startup warm-up and lazy self-heal when the LCS list changes.yarn backstage-cli package test— 335/335 pass.yarn tsc:full— clean./v1/modelsreturns in ~50ms (was up to 10s), fully enriched.🤖 Generated with Claude Code