Add fine-grained system prompt customization (customize mode)#816

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SteveSandersonMS merged 12 commits intomainfrom

mackinnonbuck/prompt-customization

Mar 20, 2026

Commits on Mar 20, 2026

Add fine-grained system prompt customization (customize mode)

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Address PR review feedback: fix docs, add examples and E2E tests

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Add last_instructions configurable section

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Fix lint: prettier formatting, Python import order and line length

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Add transform operation for system prompt section customization

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Formatting

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Add E2E snapshot for customized systemMessage config test

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Fix Go fmt blank comment line and Python import ordering

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Fix Python ty type error in session transform handler

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Fix Python E2E test to use keyword args for create_session

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Assert transform result in system message via HTTP traffic

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Fix Go transform JSON serialization: add json tags for content field

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