Fixes 567-labs#1514 Add json_system_prompt parameter to handle_json_modes() allowing users to: - Customize the system prompt with {schema} placeholder - Set to empty string to skip prompt modification entirely - Default behavior unchanged (backward compatible) This enables use cases like roleplay where the 'genius expert' default breaks character consistency. Files: - instructor/providers/openai/utils.py - Core implementation - instructor/processing/response.py - Pass through parameter - tests/test_json_system_prompt.py - 8 comprehensive tests

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Commits

Commits on Jan 25, 2026

fix(deps): move dev dependencies to correct section

feat(json): add json_system_prompt parameter for Mode.JSON customization

Commits on Jan 26, 2026

Merge branch 'main' into fix/json-system-prompt-customization

fix: use str.replace() for safe placeholder substitution