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D2 is a domain-specific language for diagramming (https://d2lang.com). Use this whenever a diagram would clarify the USER’s request. Provide raw D2 text only—no markdown fences, comments, or extra prose. Input is saved as <file_stem>.d2 in the conversation workspace and rendered to <file_stem>.png under Images/, which is returned to the USER.

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Parameters

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code
string
required
Valid D2 source (required, plain text).
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file_stem
string
required
Base filename for both .d2 and .png.
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output_dir
string
Optional absolute directory for the PNG (defaults to /home/workspace/Images).