AI Reasoning Segment Processor (shared/interleavedReasoning.ts)

Handles incremental updates and boundary marking for AI reasoning streams. Use this to manage interleaved reasoning text segments in chat interfaces.

// Source: https://github.com/jjang-ai/vmlx | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
export type ReasoningSegments = string[]

export function appendReasoningDelta(
  segments: ReasoningSegments,
  delta: string,
): ReasoningSegments {
  if (!delta) return segments
  const next = [...segments]
  if (next.length === 0) {
    next.push(delta)
  } else {
    next[next.length - 1] += delta
  }
  return next
}

export function markReasoningToolBoundary(
  segments: ReasoningSegments,
  completedToolIterations?: number,
): ReasoningSegments {
  if (completedToolIterations !== undefined) {
    // Empty reasoning is still a real assistant pass. Keep its slot so replay
    // cannot

... (truncated -- full source via MCP)