Base request

The 301-token request remaining after tools and skill-description text are removed: system blocks, messages, skill-listing structure, and request controls.

  1. Message Context: Current date reminder

    Text content block sent as messages[0].content[0] with role user.

    Type: Message context
  2. Message Context: User prompt

    Text content block sent as messages[0].content[1] with role user.

    Type: Message context
  3. Request Controls

    Non-text request controls sent by default in the SDK query request.

    Type: Request controls
  4. Skill Listing System Message

    System-role message listing SDK-shipped/runtime skills available to the Skill tool.

    Type: Skill listing
  5. System Block: SDK identity

    SDK identity system text sent by default.

    Type: System block
  6. System Block: Version metadata

    Internal Claude Code/SDK version and entrypoint metadata.

    Type: System block