GeezerVison

Purpose of the change

OpenAIChatCompletionsLanguageModel rebuilds streamed tool calls by keying deltas on tool_call.index only. Some OpenAI-compatible servers (the base_url is configurable) reuse index 0 for several tool calls, so their names and arguments were concatenated into one broken call (get_weatherget_time, with the arguments parsed as a list).

Description

Streamed tool call state is kept in arrival order. A delta is matched to the latest call with the same index, unless it carries an id different from that call's id, in which case it starts a new call. Normal streams (one index per call, id only in the first delta) behave as before, and results are still ordered by index.

Fixes/Closes

No linked issue.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Unit Test

test_generate_response_streamed_tool_calls_reusing_index streams two calls with ids call_a and call_b, both on index 0, and expects two separate calls.

Test Results: test_openai_chat_completions_language_model.py: the new test fails before the change (1 failed, 26 passed) and passes after it (27 passed, Python 3.12).

Checklist

• I have signed the commit(s) within this pull request
• My code follows the style guidelines of this project (See STYLE_GUIDE.md)
• I have performed a self-review of my own code
• I have commented my code
• My changes generate no new warnings
• I have added unit tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

Further comments

This PR was prepared with the help of an AI coding assistant (Claude Code).