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Prevents sessions from getting stuck replaying image attachments that exceed provider limits. Three new guards added to unsupportedParts(): - Unsupported MIME type: only image/jpeg, image/png, image/gif, image/webp are accepted (all major providers). image/jpg is normalized to image/jpeg. Anything else (bmp, tiff, svg, etc.) is replaced with a descriptive error. - Size limit: base64 payload > 5 MB is rejected. Anthropic enforces a hard 5 MB cap; exceeding it poisons the session history and causes every subsequent request to fail with a 400. - Dimension limit: PNG images with any side > 2000px are rejected. Anthropic rejects these in multi-image requests with a 400. Dimensions are read from the PNG IHDR header without a full decode (fast, no deps). Adds 6 new tests covering: unsupported MIME, jpg normalization, oversized payload, oversized PNG dimensions, valid small PNG, all four accepted types. Closes: anomalyco#4781 Related: anomalyco#9785, anomalyco#9512, BASIC-BIT#1
This was referenced Mar 28, 2026
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Prevents sessions from getting stuck replaying unsupported image attachments.
Upstream context: anomalyco#9785, anomalyco#4781 (related: anomalyco#9512)