Answers: when capture, dictation, or the handoff breaks
Screen capture leans on a couple of browser APIs that fail in predictable ways. These pages explain why a capture, a permission, or a handoff to your coding agent went wrong — and the fastest way to fix it.
Most capture problems trace back to one of three things: a browser permission that was denied or revoked, an OS-level protection on the window you're trying to grab, or a handoff format the receiving agent can't read. Each page below starts with the symptom, names the likely cause, and gives you the fix.
Capture and permissions
When the screen-share prompt, the capture itself, or the image quality goes sideways.
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Screen capture isn't working
The usual causes when nothing captures, ranked by likelihood.
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'Permission denied' sharing your screen
Why the browser blocked the share and how to re-grant it.
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Can't capture a video or protected window
Why some windows capture as a black rectangle.
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Captured screenshot is blurry
Resolution, scaling, and crop choices that soften an image.
The agent handoff
When the capture is fine but the coding agent can't use it.
Stop pasting screenshots into agent prompts.
Capture the screen, talk through the problem, hand your agent a markdown document it can act on. About a minute from open tab to shareable URL.
Start capturing