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Anthropic Image Clamp — DSH Plugin for DeepSeek Harness
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dsh-anthropic-image-clamp

Anthropic Image Clamp

DeepSeek Harness host plugin: downscale inline images on Anthropic Messages requests so many-image requests never exceed the 2000px per-side limit.

The plugin will be installed here. Keep web if you are unsure.

npx -y @deepseek-ai/dsh plugin --profile web add github:noahchalifour/dsh-anthropic-image-clamp#7a921fd7dbc08f599c43a2db2f01ba66a3d12890
READMECompatibilityVersions

Compatibility and provenance

Anthropic Image Clamp is published as dsh-anthropic-image-clamp and currently resolves to version 0.1.0. The Hub verifies its manifest and preserves the exact installation source for reproducible installs.

DSH compatibility
*
Runtime surfaces
any
Release source
github
Registry updated
9/26/2026

Versions

0.1.0stable
9/26/2026

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0.1.0
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License
MIT
Source
github
GitHub
★ 0
Weekly downloads
0
Last push
9/26/2026
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README

dsh-anthropic-image-clamp

Stops this Claude error in DeepSeek Harness:

messages.N.content.M.image.source.base64.data: At least one of the image
dimensions exceed max allowed size for many-image requests: 2000 pixels

Cause. Anthropic allows up to 8000px per side, but a request carrying more than 20 images is capped at 2000px per side. DSH normalizes attachments to a 2048×2048 pixel budget (8192px long edge), so a phone screenshot such as 1080×2400 is stored as-is. Once a session's history holds more than 20 images, every request fails.

Fix. This host plugin wraps fetch for api.anthropic.com/v1/messages requests and downscales any inline base64 image whose longer side exceeds maxDimension (default 2000). The results are deterministic and cached by content hash, so re-sent history stays byte-identical and the prompt cache still hits.

Install, then restart DSH:

dsh plugin --profile desktop add github:noahchalifour/dsh-anthropic-image-clamp

Config override (profile cordis.patch.yml):

- id: anthropic-image-clamp
  config: { maxDimension: 1568, hosts: [api.anthropic.com] }

Limitation: requests routed through a subscriptions-plugin HTTP proxy use undici's own fetch and bypass the wrapper. No proxy is configured on this machine.