Hey, thanks for the detailed report. The environment and steps are perfect.
Both issues are already known:
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Links in Agents/Chat on Default High Contrast fall back to a dark blue color, which is hard to read on a dark background. This is a bug on our side and we’re tracking it. Same issue here: Dark High Contrast theme Link Color Broken and [Bug] Undefined CSS variable --cursor-text-link causes hyperlinks to fall back to #0000EE — accessibility issue (Dark High Contrast).
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GitLens hover looks different from VS Code. This is also a known issue. It’s not a GitLens bug, it’s a CSS rule for hover tooltips on our side. Thread: All links and icons in hover tooltips use wrong color due to MAX MODE CSS rule.
I can’t share an ETA for fixes yet. I’ll post back once we have updates.
As a temporary workaround for readability, you can install an alternative high-contrast theme from the marketplace, for example GitHub Dark High Contrast. Links in chat usually have better contrast there.
One note: this thread includes two separate bugs. To track them more easily, it’d be best to split them into two threads. If you can, please create a separate thread for the GitLens hover issue, and we’ll keep this one for chat links.