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### Dify version
Source checkout of main at `43af5082d3c4ab8a96067370d2f86f214e3c85ae`.
### Cloud or Self Hosted
Self Hosted (Source)
### Steps to reproduce
This was reproduced at the Workflow Agent's production type-checker and output-adapter boundary.
1. Declare `meta` as `OBJECT` and `items` as `ARRAY[OBJECT]`.
2. Return output shaped like the following, where the ID also matches a resolvable ToolFile:
```json
{"meta":{"id":"11111111-1111-4111-8111-111111111111"},"items":[{"id":"11111111-1111-4111-8111-111111111111"}]}
```
3. Pass the output through `PerOutputTypeChecker`, followed by `WorkflowAgentOutputAdapter.build_success_result`, as the success path does.
4. Compare the final values to the declared object output.
The type checker marks both values READY. The adapter's legacy `{id}` file conversion then runs without consulting the declared output type and replaces them with `FileSegment`/`ArrayFileSegment` values. This also invokes ToolFile lookup for data declared as an object.
The regression uses the real type checker and adapter with a controlled ToolFile rebacker.
### ✔️ Expected Behavior
Values declared as OBJECT or ARRAY[OBJECT] preserve their object shape, including an id field, without ToolFile conversion or lookup.
### ❌ Actual Behavior
A minimal object with a resolvable id is converted into a file segment. An array of such objects is converted into an array of file segments despite its declared object item type.
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<!-- Answer -->
The code at that commit behaves as you describe. In `_normalize_output_value`, [the legacy ToolFile conversion runs before the declared output type is checked](https://github.com/langgenius/dify/blob/43af5082d3c4ab8a96067370d2f86f214e3c85ae/api/core/workflow/nodes/agent_v2/output_adapter.py#L170-L190). `declared_output` is only consulted afterwards, so it can't stop the conversion.
The legacy path is [triggered by shape alone](https://github.com/langgenius/dify/blob/43af5082d3c4ab8a96067370d2f86f214e3c85ae/api/core/workflow/nodes/agent_v2/output_adapter.py#L211-L232). A mapping whose keys are exactly `{"id"}`, or a non-empty list of such mappings, goes to the ToolFile rebacker. If the rebacker resolves the id, the result becomes a `FileSegment` or `ArrayFileSegment`. The code never checks whether the field was declared `OBJECT` or `ARRAY[OBJECT]`, and the ToolFile lookup runs even for data declared as an object. Your repro hits both cases: `meta` is `{"id": ...}` and `items` is `[{"id": ...}]`.
The adapter's docstring describes the legacy `{id}` handling as a [backwards-compatible fallback for older Agent backend builds](https://github.com/langgenius/dify/blob/43af5082d3c4ab8a96067370d2f86f214e3c85ae/api/core/workflow/nodes/agent_v2/output_adapter.py#L29-L40). A likely fix is to skip it when the field's declaration is anything other than `FILE` or `ARRAY[FILE]`:
- Run the legacy conversion only when `declared_output` is `None`, or is `FILE`, or is `ARRAY` with a `FILE` item type.
- Return the value untouched for any other declared type, including `OBJECT`, `ARRAY[OBJECT]` and `STRING`.
Undeclared fields would keep the old behavior. They have the same ambiguity, but changing them could break older backends, so a maintainer should decide that. A regression test with a ToolFile rebacker that fails if called would cover the "no lookup" expectation.
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I checked the compatibility concern against the original baseline and the implementation in #43450. Four adapter cases covering absent/empty declarations and scalar/array legacy ToolFile IDs pass on the baseline and fail with the initial PR implementation.
A supplemental patch is prepared that preserves the legacy fallback for outputs without a matching declaration while keeping explicit `OBJECT` and `ARRAY[OBJECT]` values as objects. It also reuses `SYSTEM_DECLARED_OUTPUTS` so system `text` keeps its declared type and does not enter undeclared-file inference.
With this supplemental patch, the output-adapter and type-checker modules have **63 passing tests**. Targeted lint, formatting, production-source type checks, and `git diff --check` also pass.
The compatibility tests provide an effective tenant to the adapter. The existing workflow-node caller does not forward a tenant, so node-level ToolFile lookup remains a separate wiring issue. FILE type validation is unchanged.
The supplemental patch has been validated locally and is pending upload to #43450; these results describe the prepared patch, rather than the current published PR head.