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March 9, 2026 19:42
Controlled by screenshot_quality parameter or ANTHROPIC_SCREENSHOT_QUALITY env var. Default None (lossless PNG). Set to 1-95 for JPEG compression. Made-with: Cursor
ContentResult.to_content_blocks() was hardcoding mimeType="image/png" even when the screenshot had been JPEG-compressed, causing Anthropic API to reject the tool result with a 400 error. Made-with: Cursor
base64_to_content_block() was hardcoding media_type="image/png" and the call site was dropping content.mimeType from MCP responses. This caused Anthropic API to reject JPEG-compressed screenshots with a 400 error. Made-with: Cursor
Remove /tmp/compression_log.txt writes, _log_message_sizes function, and /tmp/compression_errors.txt writes that were used during local testing of the JPEG compression feature. Made-with: Cursor
dylanbowman314
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Mar 11, 2026
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add unit tests, otherwise lgetm
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Before there was no compression for images at all. For anthropic, at least.