AlinsRan opened a new pull request, #13599:
URL: https://github.com/apache/apisix/pull/13599
### Description
In the Anthropic-messages → OpenAI-chat converter, when an OpenAI-compatible
upstream returns `tool_call` arguments that are **not valid JSON** (or decode
to a non-object such as a number/string), `convert_response` did `return nil,
"invalid tool_call arguments: ..."`. This **aborts the entire non-streaming
response conversion** and drops any already-collected text/thinking content —
the client receives nothing instead of a partial-but-usable message.
This patch falls back to an empty input object (`{}`) and logs a warning, so
the rest of the message (text, other tool calls) is still delivered.
Anthropic's `tool_use.input` must be an object, so non-object decoded values
are handled the same way as a decode failure.
Added `t/plugin/ai-proxy-anthropic.t` TEST 52 covering malformed
`arguments`: conversion still returns, text content is preserved,
`tool_use.input` is an empty object, and a warning is logged.
### Checklist
- [x] I have explained the need for this PR and the problem it solves
- [x] I have explained the changes or the new features added to this PR
- [x] I have added tests corresponding to this change
- [x] I have verified that this change is backward compatible
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