Models that don't support native function calling emit tool calls as
plain text. Instead of treating this as ToolUnsupportedError, parse the
text and execute the tool calls normally.
Handles both direct JSON and shorthand (key=value) formats with relaxed
JSON support (unquoted keys).
When a model emits tool invocations as plain assistant text instead of
using the function-calling API (e.g. "execute_code: steps=[...]"), the
loop now returns ToolUnsupportedError. This lets freeloader blacklist the
model and cycle to one that properly supports function calling.
Detection: after a turn with stopReason="stop" and no API-level tool
calls, scan assistant text for any registered tool name followed by ':'
or '('. Only fires when tools are configured.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ollie
Levi Neely
Levi Neely
Levi Neely