Function serializeMessage

src/llm/cache-layout.ts:28–39

(m: Message)

/** Canonical, stable serialization of a single message for prefix comparison.
 *  Includes exactly the fields that go on the wire and affect the KV cache. */
export function serializeMessage(m: Message): string {
  const parts: string[] = [`role:${m.role}`];
  parts.push(`content:${m.content ?? ''}`);
  if (m.tool_call_id) parts.push(`tcid:${m.tool_call_id}`);
  if (m.name) parts.push(`name:${m.name}`);
  if (m.tool_calls && m.tool_calls.length) {
    for (const tc of m.tool_calls) {
      parts.push(`tc:${tc.function.name}(${tc.function.arguments})`);
    }
  }
  return parts.join('
');
}

/** Number of leading messages that are byte-identical between two message arrays.
 *  This is the prefix the inference server can serve from KV cache. */