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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.0.75 ·

Reduced Subagent Prompt Token Usage

Entry
JSON All of v2.0.75
EntryKind: in v2.0.75,
ChangesSection of the release
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 →

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