Function hasSuccessfulToolCall

src/utils/messages.ts:4719–4761

(
  messages: Message[],
  toolName: string,
)

 * Searches backwards for efficiency.
 */
export function hasSuccessfulToolCall(
  messages: Message[],
  toolName: string,
): boolean {
  // Search backwards to find most recent tool_use for this tool
  let mostRecentToolUseId: string | undefined
  for (let i = messages.length - 1; i >= 0; i--) {
    const msg = messages[i]
    if (!msg) continue
    if (msg.type === 'assistant' && Array.isArray(msg.message.content)) {
      const toolUse = msg.message.content.find(
        (block): block is ToolUseBlock =>
          block.type === 'tool_use' && block.name === toolName,
      )
      if (toolUse) {
        mostRecentToolUseId = toolUse.id
        break
      }
    }
  }

  if (!mostRecentToolUseId) return false

  // Find the corresponding tool_result (search backwards)
  for (let i = messages.length - 1; i >= 0; i--) {
    const msg = messages[i]
    if (!msg) continue
    if (msg.type === 'user' && Array.isArray(msg.message.content)) {
      const toolResult = msg.message.content.find(
        (block): block is ToolResultBlockParam =>
          block.type === 'tool_result' &&
          block.tool_use_id === mostRecentToolUseId,
      )
      if (toolResult) {
        // Success if is_error is false or undefined
        return toolResult.is_error !== true
      }
    }
  }

  // Tool called but no result yet (shouldn't happen in practice)
  return false
}

type ThinkingBlockType =
  | ThinkingBlock