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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.0.75

Reduced Subagent Prompt Token Usage

What

Removed a duplicate instruction from subagent prompts about not using colons before tool calls.

Details
  • The instruction "Do not use a colon before tool calls. Text like 'Let me read the file:' followed by a read tool call should just be 'Let me read the file.' with a period." was removed from the subagent system prompt builder
  • This instruction remains in the main system prompt (zb function), so the guidance is still provided to the main conversation thread
  • Subagents inherit context from the parent, making this instruction redundant for them
  • This reduces token usage in subagent conversations without changing behavior
Evidence

XbA() at line 516791 (subagent prompt builder, removed duplicate colon instruction)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.0.75 →