Function buildThreadContext

server/src/routes/tavus.ts:175–197

* Build conversation context from OpenAI-format message history. * Skips system messages — Addie uses her own DB-sourced system prompt.

(
  messages: RawMessage[]
)

 * Skips system messages — Addie uses her own DB-sourced system prompt.
 */
function buildThreadContext(
  messages: RawMessage[]
): { currentMessage: string; threadContext: Array<{ user: string; text: string }> } | null {
  const chatMessages = messages
    .filter((m) => m.role === "user" || m.role === "assistant")
    .map((m) => ({ role: m.role, content: extractText(m.content) }));

  let lastUserIdx = -1;
  for (let i = chatMessages.length - 1; i >= 0; i--) {
    if (chatMessages[i].role === "user") { lastUserIdx = i; break; }
  }
  if (lastUserIdx === -1) return null;

  const currentMessage = chatMessages[lastUserIdx].content;
  const history = chatMessages.slice(0, lastUserIdx);

  const threadContext = history.slice(-10).map((m) => ({
    user: m.role === "user" ? "User" : "Addie",
    text: m.content,
  }));

  return { currentMessage, threadContext };
}

/**
 * Build user-scoped tools for a voice call, matching the web chat tool set.