Stabilizing Plan/Act Mode: Delegating SystemPrompt's Tool Guide to ToolSpec#201
Merged
daisuke-awaji merged 1 commit intomainfrom Jul 16, 2025
Merged
Stabilizing Plan/Act Mode: Delegating SystemPrompt's Tool Guide to ToolSpec#201daisuke-awaji merged 1 commit intomainfrom
daisuke-awaji merged 1 commit intomainfrom
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Issue Fixed
Fixed a hallucination issue where Claude models (particularly Sonnet 4 and other high-end models) would attempt to execute write operations through tools even when:
These tools were explicitly disabled in ToolSpec
The system was in Plan mode
Root Cause
The issue occurred when the SystemPrompt contained instructions about tool usage that conflicted with the actual tool permissions defined in ToolSpec.
Solution
Moved all tool usage instructions from the SystemPrompt to the ToolSpec Description field, ensuring that the model receives consistent information about available tools and their permitted operations.
This change helps prevent the model from hallucinating tool capabilities based on conflicting information sources.