bug: Jan-v2-VL — Model Features Missing After Download (Vision + Proactive Not Loaded)

[paulhugel]

Summary

When downloading any Jan-v2-VL model variant from the Hugging Face Hub into Jan, the app recognizes only one capability: • Tools

However, the model card on Hugging Face clearly advertises three supported features: • Tools • Vision • Proactive

After import, Jan drops the Vision and Proactive capabilities entirely. Users must manually edit the model configuration to restore the correct feature set. This appears to be a metadata parsing / capability-detection regression in Jan.

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Environment • App: Jan • Version: 0.73 (and related builds) • Backend: llama.cpp • Backend Build: B6929 / macos-arm64 • Platform: macOS (Apple Silicon) • Affected Model: Jan-v2-VL (all variants) via Hugging Face Hub • Reproducibility: 100% • Previous versions: Other Jan models loaded full capabilities correctly

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Expected Behavior

When Jan imports a model from the Hugging Face Hub: 1. All declared model capabilities should be parsed correctly. 2. Jan-v2-VL should automatically display three features: • Tools • Vision • Proactive 3. No user intervention should be required.

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Actual Behavior

After downloading Jan-v2-VL: 1. Only Tools is listed under model features. 2. Vision and Proactive are missing. 3. The model loads but runs in a reduced-capability mode. 4. Users must manually modify the model configuration to enable:

{ "tools": true, "vision": true, "proactive": true }

5.	Once manually enabled, all features work — confirming the model supports them and that detection failed on Jan’s side.

This indicates a model-card parsing bug or incomplete multi-feature support during import.

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Steps to Reproduce 1. Open Jan. 2. Go to Models → Add → Hugging Face Hub. 3. Search for and download Jan-v2-VL (any variant). 4. Open the model’s Details / Configuration inside Jan. 5. Inspect the Features list.

Observed: Only Tools is present; Vision and Proactive are missing.

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Workaround

Manually edit the model’s feature configuration:

{ "tools": true, "vision": true, "proactive": true }

This restores full functionality, proving the imported model is fine and the issue lies in Jan’s feature parsing.

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Impact • Users believe the model has Tools-only capability, which is incorrect. • Vision and Proactive features — core to Jan-v2-VL — remain disabled by default. • Causes confusion, degraded user experience, and inconsistent behavior with the model as published on Hugging Face. • All Jan-v2-VL variants imported through Jan are affected.

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Suspected Root Cause • Jan reads the first capability from the Hugging Face model metadata but does not parse the full feature list. • Multi-capability models (Tools + Vision + Proactive) are reduced to Tools only. • Indicates a mismatch between Hugging Face’s metadata format and Jan’s model import parser. • Automatic detection of "vision" and "proactive" fields appears non-functional for this model family.

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Suggested Fixes

1. Correct Hugging Face model-card parsing • Read the full "features" list instead of only the first entry.

2. Automatically enable all advertised capabilities

If the upstream model lists Tools, Vision, and Proactive, Jan should load all three by default.

3. Add capability-consistency validation

If the imported model metadata contains more features than Jan detected: • Show a warning, or • Offer an “Enable all features” action.

4. Ensure manual user edits aren’t required

Models should load with correct capabilities out of the box.