fix(agent): remake JsonUtil

[samchon]

This pull request refactors and simplifies JSON utility handling and validation failure stringification in the core package. The main changes include consolidating JSON correction logic to use only the jsonrepair library, moving and enhancing the stringifyValidateFailure logic into JsonUtil, and updating all related usages and tests accordingly.

JSON utility refactor and validation failure handling:

• The JsonUtil utility is refactored to use only jsonrepair for JSON correction, removing the previous multi-step correction pipeline and the dependency on es-jsonkit. (packages/core/package.json, packages/core/src/utils/JsonUtil.ts) [1] [2]
• The stringifyValidateFailure function is moved into JsonUtil, rewritten for clarity, and now provides improved annotated output for validation failures, including missing properties and error comments. (packages/core/src/utils/JsonUtil.ts)
• All usages of stringifyValidateFailure are updated to reference the new JsonUtil.stringifyValidateFailure. (packages/core/src/orchestrate/call.ts, packages/core/src/utils/stringifyValidateFailure.spec.ts) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]

Test updates and cleanup:

• The standalone JsonUtil.parse test suite is removed, likely because the correction logic it tested is now handled by jsonrepair and/or is no longer relevant. (packages/core/src/utils/JsonUtil.spec.ts)
• The tests for validation failure stringification are updated to use the new JsonUtil.stringifyValidateFailure and remain comprehensive. (packages/core/src/utils/stringifyValidateFailure.spec.ts) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

[Copilot]

Pull request overview

This pull request refactors JSON utility handling by consolidating JSON correction logic to use only the jsonrepair library and moving the stringifyValidateFailure function into JsonUtil. The changes remove the dependency on es-jsonkit and simplify the JSON parsing implementation.

Key changes:

• Simplified JsonUtil.parse() to use only jsonrepair for JSON correction
• Moved stringifyValidateFailure logic from a standalone module into JsonUtil
• Removed es-jsonkit dependency from the project

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Removes es-jsonkit package dependency and type-fest catalog entry
packages/core/package.json	Removes es-jsonkit from dependencies
packages/core/src/utils/JsonUtil.ts	Simplifies parse to use only jsonrepair; adds stringifyValidateFailure and helper functions
packages/core/src/utils/stringifyValidateFailure.ts	File deleted (functionality moved to JsonUtil)
packages/core/src/utils/stringifyValidateFailure.spec.ts	Updates all test references to use JsonUtil.stringifyValidateFailure
packages/core/src/utils/JsonUtil.spec.ts	File deleted (parse tests removed entirely)
packages/core/src/orchestrate/call.ts	Updates imports and function calls to use JsonUtil.stringifyValidateFailure

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.