Problem

Manual tool calling broke in v0.1.14. When passing tool schemas without max_turns, the LLM doesn't see the available tools and responds normally instead of making tool calls.

Root Cause

In client.py line 330, the code uses kwargs.pop("tools") which removes tools from kwargs. When max_turns is None (manual tool calling mode), execution reaches line 355 which calls the provider without tools in kwargs, causing the LLM to not see the tool schemas.

Reproduction

import aisuite as ai

# Manual tool schema
tools = [{
    "type": "function",
    "function": {
        "name": "get_time",
        "description": "Get current time",
        "parameters": {}
    }
}]

client = ai.Client()
response = client.chat.completions.create(
    model="openai:gpt-4o",
    messages=[{"role": "user", "content": "What time is it?"}],
    tools=tools,  # Tools schema is lost!
)

# Result: LLM doesn't see tools, responds normally
# Expected: LLM makes a tool_call

Solution

1. Line 330: Changed from kwargs.pop("tools") to kwargs.get("tools") to preserve tools in kwargs
2. Line 345: Added explicit kwargs.pop("tools") when using max_turns, since _tool_runner handles them separately
3. Added tests: Comprehensive test coverage to prevent future regressions

Changes

• aisuite/client.py: 3 lines changed
• tests/client/test_manual_tool_calling.py: New test file

Impact

✅ Manual tool calling (no max_turns): Now works correctly
✅ Automatic tool execution (with max_turns): Continues to work as expected
✅ No breaking changes to existing functionality

Testing

Added unit tests that verify:

• Tools are passed to provider in manual mode
• Tools are not duplicated in automatic mode
• MCP config processing continues to work

All tests pass:

pytest tests/client/test_manual_tool_calling.py -v

Related

• Fixes the documented workflow at https://github.com/andrewyng/aisuite#manual-tool-calling-no-max_turns
• Regression introduced in v0.1.14 (worked in v0.1.11)

Co-Authored-By: Warp agent@warp.dev