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Ben Thomas
76772ffc19
* Fix function_call_output.output to be a JSON string on the wire
OutputConverter was passing the JSON serialization of complex tool results (e.g. List<TodoItem>) directly into OutputItemFunctionToolCallOutput via BinaryData.FromString. The Responses SDK treats that BinaryData as the *raw JSON value* for the field, so non-string results landed on the wire as an unquoted JSON array (e.g. `"output":[{...}]`) instead of a JSON string.
The OpenAI Responses spec requires `function_call_output.output` to be a JSON string. The strict-parsing OpenAI .NET client (FunctionCallOutputResponseItem) consequently failed when threading a follow-up turn that replayed such an item, with: `The JSON value could not be converted... requires an element of type 'String', but the target element has type 'Array'`.
Always wrap the payload as a JSON string literal:
- string s -> JSON-encode s (quoted, with escapes)
- object o -> JSON-serialize o, then JSON-encode the resulting text
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* Address PR feedback: JsonElement special-case, symmetric inbound unwrap, tests
OutputConverter: extract EncodeFunctionResultAsJsonStringPayload helper
that special-cases JsonElement / JsonDocument so a string-kind element
does not get double-encoded into "\"value\"". Other JsonElement kinds
(object/array/number/bool) round-trip via GetRawText() and are then
JSON-string-wrapped, matching the spec.
InputConverter: symmetric DecodeFunctionResultPayload added to
ConvertFunctionCallOutput and ConvertFunctionToolCallOutput so
previously-stored function_call_output items replayed via
previous_response_id unwrap back to the original tool result text
instead of leaking the JSON-encoded form into FunctionResultContent.Result.
Legacy non-conforming raw-JSON-value payloads pass through unchanged.
Tests:
- Replace ConvertUpdatesToEventsAsync_FunctionResultStringPayload_EmittedAsRawTextAsync
with EmittedAsJsonStringAsync asserting the new wire contract ("sunny" -> "\"sunny\"").
- Add coverage for object payloads, JsonElement string kind (no double-encoding),
and JsonElement array kind (JSON-stringified).
- Add InputConverter round-trip tests for spec-compliant JSON-string payloads
and legacy raw-JSON-array payloads.
All 663 tests pass on net8/net9/net10. Verified end-to-end against the local
hosted-harness sample: T1-T4 (incl. TodoList tool replay across turns) all
succeed with no SDK parse errors.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---------
Co-authored-by: alliscode <bentho@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
76772ffc19
·
2026-05-07 23:27:57 +00:00
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