- Propagated `schemaOverridden` from `YieldTool` into executor `YieldItem` metadata.
- Bypassed schema validation on override or schema-builder errors and kept payload output with success exit.
- Emitted `SUBAGENT_WARNING_SCHEMA_OVERRIDDEN` so accepted override results no longer surface as `schema_violation`.
- Unified output schema construction and validation by adding buildOutputValidator and using it in YieldTool and task executor.
- Added MAX_SCHEMA_RETRIES so YieldTool now retries schema failures three times with hints before overriding.
- Updated failure handling to use shared summarizeValidationFailure and formatters for required-field reporting.
- Added tests for output-schema-validator and YieldTool covering malformed schemas and nested-array retry edge cases.
- Extracted `description` from type-array and nullable branches so it lives on the wrapper, not duplicated onto each variant.
- Replaced inline enum-type inference with `inferStrictPrimitiveTypeFromEnumOrConst`, covering both `enum` and `const` in sanitize and enforce paths.
- Mixed-primitive enums and non-primitive consts now fall back to non-strict instead of producing a typeless schema that OpenAI rejects on the wire.
- Preserved object schemas with explicit `additionalProperties` settings by avoiding strict coercion to false.
- Probed schema strictness before sanitization and set `tool.strict` false for non-strict schemas.
- Set `tool.strict` false for `null`, `true`, and unconstrained `outputSchema` fallbacks.
- Documented the fix in Unreleased changelog entries for both `ai` and `coding-agent` packages.
- Added regression tests covering loose `additionalProperties` and yield strictness behavior across tools.
YieldTool's unresolved-ref fallback now skips literal-value positions such as const, enum, default, and examples when looking for unresolved schema refs. Valid schemas containing data literals like { "": "literal" } no longer degrade to the loose schema and still reject invalid yield payloads.
dereferenceJsonSchema leaves $ref strings in place when references are unresolvable (external URLs, missing definitions, certain cycles). The new yield-parameters builder now walks the resolved schema for any remaining $ref strings before installing validation; if any are found, it throws so the existing catch branch swaps in looseRecordSchema and disables strict validation. Previously YieldTool installed a validator that rejected every success payload with an unresolved-reference error.
- Renamed subagent completion flow from `submit_result` to `yield` across SDK tools, prompts, and docs.
- Updated executor/task handling to require and parse `yield` calls, replacing legacy submit-result extraction and state flags.
- Added `subagent-yield-reminder` and updated system prompts to require `yield` with `result.data` or `result.error`.
- Renamed hidden-tool and registration plumbing to `yield`, including discovery helpers and renderer/test surface.
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